Long story short, I started my new job 4 months ago. It's been fantastic and I'm really happy. I also managed to negotiate a bonus , even though nobody else receives one. The MD said that they'd implement across the whole company in the new year.
Fast forward and we've got a new hire and they don't have a bonus! Mine is in the offer letter, but the contract actually says it's discretionary.
I'll still ask about it once I pass my probation but I'm not super hopeful!