As mentioned they were just classed as imports in the record shops and on mail order lists, they used to come with an official looking sticker on the sleeve (some I've still got have a "mecolico" logo and "specially imported by soul bowl" etc)
There must have been a majority of pressings with some legal reissues and the odd originals all mixed in?
Cant remember much about them at venues, I bought most of mine from local record shops.
Cost was 85p in 1974 for imports and I think British were 55p and looking at old Black echoes they'd gone up to £1.25 by 1978