Admission - well, I know that the GB are ultimately responsible for the budget, although day to day operational decisions about the budget are surely the responsibility of the staff, and given that governor refreshments are hardly a strategic issue, it seems a bit over the top to use that line of argument...
About your question: we buy into our (very good) county council-provided training for a small annual subscription. I'm not sure if there is a budget for governor expenses (I have never claimed for any as I haven't had any).
The full GB does not appear to set the overall budget - I assume the Resources Committee does, although they only met in Sept and then again last week (I am on a separate sub-committee, and have only been a governor since Sept, so I am still finding out (a) what the GB should be doing and (b) what the GB actually does do, which so far does not always seem to be the same as (a)).
In latest developments: the agenda is now out for the full GB meeting next week, and "Tea and Coffee" has mysteriously appeared as a whole agenda item (??! what is there to discuss?!). Meanwhile the Deputy HT has not responded to my email asking him to reply to my email of 8 days ago asking for school-provided refreshments...