Chunks of prawn cracker are flying through the air, next comes an ominous crash. It's not the best start, but this, I am told, is the latest innovation in food delivery – service by drone. With their reputation as controversial killing machines, it's not the most obvious fit, but food outlets seem intent on proving such warlike techonology has an altogether more civilised use – if only they could get them to behave. Earlier this month, Domino's Pizza released a video of what it called its "DomiCopter", a pizza-delivering lightweight aircraft – and now YO! Sushi is developing its "first flying serving tray", to be rolled out next year. It has a lightweight carbon fibre frame with four propellors, two fixed cameras and its own Wifi connection, and is controlled using an iPad app. But when I visit the chain's Soho restaurant to have a look at how the trial is going, there are a few teething problems. Not yet capable of carrying the weight of the burger it was designed to serve, it is being tested outside with polysterene food and prawn crackers.

But the inexperienced pilot is finding it hard to get it off the ground, and almost impossible to control once it's hovering. Instead of flying serenely in front of him and landing gently on the table, the machine drunkenly lurches around at knee height, crashing into camera tripods and chairs or just the ground, as the pilot mutters darkly about the wind factor and low batteries. Its rotor blades are said to be powerful enough to speed it along at 20mph, at a range of 50m, but they also mean that when the tray tilts and the prawn crackers fall out they are chopped and sprayed through the area. As it heads dangerously close to the road, and passers-by swerve out of the way, I am told that it worked perfectly in the workshop. But its unpredictable behaviour is at least drawing the crowds. As it hits the floor once more, Michael Lim, 21, from London, is entranced. "I think it's amazing and would love it to serve me," he says. "As long as the rotor doesn't hit me." Sushi customer Deeviya Meir, 25, is equally forgiving.

They are already fans of the chain's distinct conveyor-belt service - which allows customers to pick dishes as they move past them. "It definitely grabs your attention," says Meir. sushi online brussels"And it does look good."sushi las condes take But Claire Lubert, 35, sounds a sensible note of caution, "I would have to wait to see how it works with wine – or miso soup – first."order sushi in dubai Get Our Free Weekly Email!tupperware sushi maker recipes For all the latest deals, guides and loopholes - join the 10m who get it. sushi go round 2 free download

We check every deal, but if something's changed, please report it Can you find it cheaper? Ensure you Compare prices first, offers aren't necessarily cheapest. There's a risk any company can struggle, so learn to Shop Safely.where to buy live eel in singaporeSushi �2.80 plates Mon- FriSimply turn up at most Yo! sushi galore london ontario deliverySushi restaurants between Monday and Friday until Fri 27 Jan, pick any blue plate from the conveyor belt or order anything on the Yo! Festival menu and pay only £2.80 per dish. The offer's not valid on drinks or takeaway. With the most expensive plates in the offer usually £4.55 - including the popular vegan tofu katsu curry and the chicken katsu curry - you could save up to 40% (£1.75) per dish. The offer is available at more than 50 restaurants (see 'more info' below to see if your local is participating) and all dishes are subject to availability.

Vegan options also include inari sushi, pumpkin katsu and the vegetable versions of gyoza, chahan and yakisoba. See the Veganuary website for more offers on vegan food during January. More info Offer only valid at Yo! Sushi: Aberdeen Bon Accord, Aberdeen Union Square, Bath, Baker St, Belfast, Birmingham Grand Central, Birmingham Selfridges, Bluewater, Bond Street, Brent Cross, Brighton, Bristol Cabot, Bristol Cribbs Causeway, Bromley, Cambridge, Cardiff St. Davids, Chelmsford, Cheltenham, Cheshire Oaks, Chester, Croydon House Of Fraser, Derby, Eden High Wycombe, Edinburgh Harvey Nichols, Edinburgh Princes St, Exeter, Finchley Road, Fulham Broadway, Glasgow Braehead, Glasgow Silverburn, Guildford, Harrogate, High Street Kensington, Kingston, Lakeside, Leamington Spa, Leeds Trinity, Leicester, Liverpool ONE, Manchester Arndale, Manchester Piccadilly, Meadowhall, MetroCentre, Milton Keynes, Newcastle Grainger Street, Norwich, Nottingham, Oxford, Plymouth, Reading House Of Fraser, Richmond, Russell Square, Southampton, St Paul's, Victoria Station, Waterloo Station, Windsor, Whiteley Shopping and York.

Offer not applicable on miso, drinks or takeaway.Sushi 25% off food for studentsIf you sign up online to the Yo! Club, you can get 25% off at all Yo! Sushi restaurants across the UK from Tuesday to Friday and on Sunday. To get the discount, simply check the 'I am a student' box when you sign up, and you'll be sent a unique code which you'll need to present along with your student card in the restaurant to get the discount. It's valid on food only, and not on drinks or takeaway or alongside any other offers and promotions. More info It's one per student, per meal with a valid NUS, UCAS or International Student card.Sushi �2.80 platesSimply turn up at most Yo! Sushi restaurants on a Monday, pick any blue plate from the conveyor belt and pay only £2.80 per dish. The offer's not valid on drinks or takeaway or anything not on the Blue Mondays menu. With the most expensive plates in the offer usually £4.55, you could save up to 40% (£1.75) per dish. The offer is available at more than 60 restaurants, although a few locations are excluded (see 'more info' below) and all dishes are subject to availability.

More info Offer not valid at Yo! Sushi: Edinburgh Airport, Edinburgh Princes Street, Gatwick North, Heathrow Terminal 2 & 3, London Harvey Nichols, London Selfridges, Southbank, St Pancras Station or Westfield White City. Offer valid for dishes off the conveyor belt only and not applicable on miso, drinks or takeaway.Sushi 25% off for armed forcesAt all Yo! Sushi restaurants across the UK, customers who show a valid MoD ID card from Tuesday to Friday will get 25% off dishes from the conveyor belt, including daily specials. This deal is valid on a maximum of 10 dishes per military personnel. Discount cannot be used on drinks, takeaway items or alongside any other offers and promotions. More info Valid on food from the conveyor belt only.Sushi �2.80 plates Mon- FriSimply turn up at most Yo! Sushi restaurants between Monday and Friday until Fri 23 Sep, pick any blue plate from the conveyor belt or order anything on the Yo! Festival menu and pay only £2.80 per dish.

With the most expensive plates in the offer usually £4.55 - including the award-winning vegan tofu katsu curry and the chicken katsu curry - you could save up to 40% (£1.75) per dish. �10 four-plate lunch at Yo! SushiIf you sign up to the newsletter at Yo! Sushi before Fri 27 May, you can get four plates for £10 Tuesday to Friday from 11.30am until 3pm. You'll receive a unique discount code by email which you can then show to staff to get the deal. Yellow and grey plates aren't included in the offer, and you can only have a maximum of one pink and one orange plate per bundle, but you could still save £6ish. It's worth noting you'll not save if you have four green plates, but you'll save even if you just order four blue plates. It's valid in participating Yo! Sushi restaurants, see full T&Cs to see the full list.Sushi takeaway �22 for twoFrom Thu 11 Feb until Mon 7 Mar, order a 'Taste of Tokyo' takeout at Yo! Sushi and you'll get dinner and drinks for £22.

We've totted up the cost, and if you bought the items individually they'd cost between £24.90 to £29.90, saving a minimum of £2.90 and a maximum of £7.90 With this offer you'll get: Sharing bento - norm £11.50 Edamame - norm £1.90 Salad - spicy chicken salad (norm £4.20) or goma salad (norm £3.60) or beef tataki salad (norm £4.60) Mochi - chocolate or strawberry cheesecake (norm £4.10) Drink - one bottle of 300ml Hakushika Ginjou sake (norm £7) or two bottles of 330ml Asahi beers (norm £7.80) or any two soft drinks (Coke, Diet Coke, Sprite, still or fizzy water, norm £3.80). Alcohol options aren't available in some restaurants, see 'more info' below for details. The sharing bento contains fish so isn't suitable for vegetarians. More info This offer isn't valid at Yo! Sushi Heathrow T2 or T3 and can't be used with any other offer. You can't get the sake or beer from the following Yo! Sushi restaurants: Richmond, Leamington Spa, Newcastle, Bond Street, High Street Kensington, Chester, Cheltenham, Brighton, Guildford, Fulham Broadway, Cheshire Oaks, Russell Square, Kingston, Whiteley Shopping and Manchester Arndale.

Sushi �2.70 platesSimply turn up at most Yo! Sushi restaurants, pick any blue plate from the conveyor belt or menu and pay only £2.70 per dish. The offer’s valid Mon-Fri until Fri 29 Jan. With the most expensive plates in the offer usually £4.50, you could save up to 40% off (£1.80) per dish. The offer is available at more than 60 restaurants, although a few locations are excluded (see 'more info' below).Sushi: Charing Cross, Chelmsford, Dublin, Edinburgh Airport, Gatwick North, Heathrow Terminal 2 & 3, London Selfridges, Manchester Selfridges Trafford, Birmingham, London Harvey Nichols, Paddington Station and Westfield Stratford. Offer valid for dishes off the conveyor belt only and not applicable on miso, drinks or take-away.Sushi food, beer & wine �2.50 eachSimply turn up at most Yo! Sushi restaurants, pick any blue plate from the conveyor belt and pay only £2.50 per dish. You can also get bottles of Kirin Beer and glasses of red or white wine for £2.50 each (norm £4ish).