Hi Mark, happy birthday.
If it makes you feel better then I too was working on my birthday - a 12 hours shift too. I was compensated slightly by the pub round tthe corner from work being a real-ale pub with usually 7 or 8 different beers on not to mention the bottled stuff they sell. Had a couple over lu=nch - very nice.
You are hereby authorised to go out for the evening to Zero Degrees and enjoy their superb pizzas and beer. This also entitles you to return with a couple of the 5L kegs (of your choosing). This voucher will self destruct when the missus sees it

Say hi for me.
Regards,
Tony.