Food-on-the-go retailer Greggs surprised unsuspecting gourmets by serving up lunch under the guise of an artisan delicatessen at a top London food festival.

The high street brand went undercover to showcase its new summer lunch offering to foodies but with a twist. The menu includes a feta and beetroot dip salad with a roast vegetable grain, an oriental chicken sticky rice salad and their first ever vegan addition – a Mexican bean wrap.

A covert video released today shows food fans praising tapas-style dishes served from a hipster deli called ‘Gregory and Gregory.’ The viral video captures their stunned reactions as told they’re actually eating from Greggs.

The brand installed the pop-up ‘undercover Greggs’ at Foodies Festival - a three-day event attended amongst some of the biggest names in the business including Michelin-starred chefs from the UK’s top gourmet restaurants and TV chefs.

The high street brand wanted to trial its new menu on some of Britain’s most discerning palates so they booked a pitch amongst the street food and artisan producers in the market area of the festival site that would convincingly blend in with the upmarket array of stalls.

The food which was freshly prepared by Greggs included salads, pasta, rice dishes and vegan wraps.

When told he was in fact eating Greggs, one surprised festivalgoer said: “You wouldn’t normally find me in a Greggs but I think what they’ve done with these new salads is brilliant. I’ll certainly be popping in there for lunch in future.”

Another customer said: “Greggs – you think of pasties, don’t you, and sausage rolls. I genuinely found this range of salads and wraps surprisingly good!”

Malcolm Copland, commercial director at Greggs said: “London is a global gourmet destination from its street food scene to the incredible array of critically acclaimed restaurants – so where better to try out our new lunchtime range. The reaction to the new menu has been fantastic and we’re now rolling it out across the UK.”

Celebrities who attended the festival included new Saturday Kitchen host Matt Tebutt, Michelin Starred Chefs Atul Kochhar, Josh Eggleton, Stephen Crane, Robert Potter and Brad Carter as well as top TV chef Glynn Purnell, MasterChef Winner 2017 Saliha Mahmood-Ahmed & healthy eating sensation Bettina Campolucci-Bordi.

The annual event held in Syon Park is the UK’s biggest food festival.