Was in London last week, nipped into both. Tried on jeans in Evans, even a size 16 was too big (and I am SO not a 16). Went into Horrible Ann Harvey, Polyester Queen, and overheard the woman saying to a customer, "No, the sizes come up much bigger than in regular shops. If you're a size 16 in M & S, there won't be anything here to fit you."
Is this not going to lull porkers (I am one, I am allowed to say that) into a false sense of their own size, if they think, oh I am "only" a size 16, which is not too bad, when actually they are probably a 22+ in "normal" shops?