I think the 1970s and '80s in the UK were the heyday for this sort of thing. Typically you'd have a couple of pints at lunch time - a lot of offices had bars (rather like coworking spaces today..) and often just stay in the pub. The drinking culture had got larger because of the growth of the middle class - more people moving into office jobs.

By the time I entered the workforce in 1999, this sort of thing was on the wane, although it varied enormously by industry and company. I think the change happened because of the increasing computerisation of jobs (where you could do more damage with the tap of a finger), in addition to women joining the workforce in more senior positions. And probably longer commutes, tougher drink-driving laws, and more formalised HR policies.

A small part of me is nostalgic for it, but it was obviously ridiculously unhealthy. That said, a lot of work was actually done in the pub, and it's possible that people found solutions with their social guard down that they wouldn't have found whilst in the office.