My ex was a film location manager for that shower, she got paid a fortune, fancy hotels, everything free. They won't get a penny from me.
It's worth noting that the BBC will get very good rates on most hotel bookings as they'll be doing it in bulk and at business rates (so might be paying far less than the headline rate).
So a "fancy" hotel might actually have been cheaper than other options, especially if they were booking for cast and crew*.
IIRC the BBC typically pays it's staff well under the commercial rates, with the disparity increasing as you go up the ladder.
So for a low level staffer the rate might be the same/slightly lower than say ITV or Sky, but by the time you get to the senior posts you might be getting paid a fraction of it (IIRC the top 10 or 20 BBC staff between them get paid less than ITV's top guy, less than the Daily Mail editor, and you'd probably need the top 50 staff to reach the same salary as the head of Sky).
They are also far more stringent on expenses than other broadcasters, IIRC they tend to really tight on a lot of things.
It may have been different in decades gone by, but certainly the last 10 years or so at least they've been really tight fisted.
*The mail made a big thing about one such hotel where the BBC had booked beds at a "£150 a night hotel", it turned out that they'd booked rooms at a B&B at the non peak bulk advance rate of about £40 or £50 a night as it was the nearest suitable place to where they were filming (saving on travel costs and meaning more time could be spent filming).