I suspect that for many British clubs the benchmark post-pandemic may not turn out to be 1976, but 1946, and post-war re-opening....it's very striking to look at membership numbers and facilities offered by even well-known clubs and courses in the decade after WW2 (check out e,g the appendices to Patric Dickinson's Round of Golf Courses of 1951 for some quite spartan post-war examples).
When the Royal St David's Golf Club reconvened in August 1946 for its first Summer Meeting post-war, there were c260 members on the roll, and the clubhouse catered very modestly for drinks, sandwiches (in the simple British sense - no burgers!) and afternoon teas only (and was dry on Sunday). If you wanted a proper lunch between rounds or any other main meals, you had to go back to your hotel or lodging for same. This situation persisted at least until the early 1960s, during a period in which the RStD hosted such important British events as the Ladies Championship and both sets of Home Internationals (as well as the various Welsh national championships).
Would that level of service be acceptable to visitors or indeed members now? Very possibly not, and for a club like RStD that (as Duncan notes above) has always received more in green fees than in annual subscriptions (which remain between £700 and £250 per annum, depending upon local residence), the implications of a change in the visitor proposition are potentially very significant. That said, modest Welsh clubs like Borth have already given up full-time catering and bar opening, using member support to provide drinks and refreshments on high days and holidays. I suspect we shall see a lot more of that in the future.
Resolving these post-pandemic financial challenges is going to be fundamental for 95% of British golf clubs over the next decade. Substantial multi-course facilities like Gullane or Lahinch or Ballybunion or Dornoch that receive quite a lot of tour operator business may well be differently exposed, but I'll be amazed if we don't see a scaling back of expenditure on 'nice-to-haves' (like smart practice facilities) and a concentration of very limited resources upon the core course proposition, and a shrunken and sustainable clubhouse and catering proposition. I personally wouldn't mind that at all, but I am genuinely not sure how typical such a response would be?