Where I worked in the mid- to late-'90s, we had a bar on site, which opened at 5pm (possibly only on Fridays, I can't remember.) It closed around 2000, but rumour had it that it lasted so long because it was so profitable.
You weren't meant to drink during working hours, but pub lunches did sometimes happen, and the main reason they didn't happen often was because it was a faff to get to one from where we were located. After work drinks could be very boozy indeed, and if taken out by vendors, occasionally still included pole dancing bars and the like (very male dominated, but the culture was fortunately changing there.)
Now, different employer, but not such a different culture (especially going by reminiscences of pre-millenium work events from long-serving staff,) there's meant to be no alcohol on site, though I think it's occasionally allowed if there's a sort of reception event on site. Definitely not meant to drink at work. People might have a pint if they go out for a pub lunch, but that doesn't happen that often. There are rules about what you can give (and accept) as gifts, and it doesn't include alcohol (because it's not inclusive of all religions or others who don't drink for any reason.)
You can claim one alcoholic drink wiyh dinner on expenses if travelling away for work (or could- it's a long time since I I travelled for work, and I know there have been some expense policy changes.) If you're out as a group, bottles of wine etc should be on the expenses of the most senior person there. There are also rules around what you can accept from vendors and others who arrange meals out for work reasons.
People might still drink if we go out in the evening, but not as much, but I think that's more to do with being middle-aged parents and driving as much as anything. But also more awareness of harassment possibilities. But mostly not being able to cope with hangovers any more!