No it’s not - we’ve done this many times in London in all sorts of places, chains, small restaurants and even a very fancy restaurant (the waiters there looked positively happy when we asked).
We don’t do it often only because we don’t over-order as a general rule (c.f. my wife’s Chinese family in Canada who over-order every time we go out and take whatever is left home).
We don’t do it often only because we don’t over-order as a general rule (c.f. my wife’s Chinese family in Canada who over-order every time we go out and take whatever is left home).