Definitely not the case in the UK - in fact there was quite fuss made when there was a plan a few years back to introduce ID cards.
Mind you I suspect mostly people do carry 'official' identification documents on them most of the time (e.g. driving licenses) but there is no requirement to actually have these on you at all times.
Mind you I suspect mostly people do carry 'official' identification documents on them most of the time (e.g. driving licenses) but there is no requirement to actually have these on you at all times.