my_hat_stinks

This is true for all public holidays in the UK, there’s a (usually) fixed number of public holidays but the dates are flexible.

They’re also included in the minimum 28 days paid time off too, meaning if you’re a full time worker and have to work on a bank holiday your employer is legally required to offer an extra day off somewhere else instead, either a fixed date or added to your holiday allowance. Conversely, the “extra” day off you get when a monarch keels over may be subtracted from your holiday allowance for the year. This is also why my employer is allowed to follow English bank holidays despite having next to no presence in England; the number is fixed but the dates are not.

UK is under BST (UTC+1) for half the year but people are usually just taught that the UK is GMT (UTC+0) which is based in the time in Greenwich, withought mentioning DST. I suppose it’s also possible everyone is taught BST and just forgets about it because daylight savings sucks, but either way most people seem to think GMT and UK time are the same thing.

This means you’ll get people asking for GMT times when they want BST or UK local time.

If they’re genuine friends they’ll be receptive when you ask them to pay you fairly.

I’d say you’re very underpaid, I’m making about 50% more than that in a fully remote UK-based mid-level position. You should start looking for a new job, even if it’s just as leverage to get paid fairly at your current place.