Ian Jelf wrote in
:

I confess I'd not taken much notice of staffing levels of ticket
offices. They're not really a facility I much use.

...

My main point of surprise is the lack of ticket office openings at even
Central Area stations. I'm genuinely amazed at the Baker Street
scenario. Is it the same now at other "big" Central Area stations?
Did this come in with the New Year or have I just not noticed before?

Full details are at http://journeyplanner.tfl.gov.uk/im/SI-T.html (click on
the station name and choose "ticket office opening hours" from the menu).

You will find many on very short hours at weekends or closed completely -
given so many travellers will either have travelcards bought in the sticks
or Pre-Pay it doesn't seem too unreasonable, though if your journey
requires a paper ticket not available from a machine (like mine frequently
does) it can be a right pain!

But I guess it beats having them closed completely, which was the original
plan.