In that particular example, the council employs somebody, whether paid or unpaid, to sell beer and that person is not selling beer, but giving it away. That is a matter for the council's disciplinary procedure. If proven, that person should no longer be allowed to sell beer.
In theory, as dogs aren't just for Christmas, internal auditors aren't just for spring. Anybody may write to the internal auditor at any time to highlight concerns, but, unless these are of a very serious nature, they would be investigated as part of the normal audit process. Some councils, mainly larger ones, have an ongoing dialogue with their IA throughout the year.
Budgets are budgets. As much as I'd like to see them being an important aspect of the council's day-to-day operations, as set out in standing orders and financial regulations, sadly, they are frequently shelved shortly after adoption. Under the normal timetable, the public would have the opportunity to ask questions about the budget at the annual parish meeting, although things have been different during the pandemic.