Yikes, >£7 for the equivalent of a burger ??
Maybe I'm a miserable old skeptic (OK, no maybe about it), but just sounds like a chain trying to jump on the trendy side of the eco bandwagon to me. For starters, why have three restaurants so close together when spreading them out would reduce the amount of travel needed to visit one - that'd save a few KG of CO2 ! "Everything we serve is grown, gathered, sourced and prepared to make the least CO2 possible" - presumably then fruit and veg is being grown on the roof of the restaurant in the middle of a polluted city ... yeuk!.