So I just got a job as a part time food courier and when I applied it said there would be a £250 bonus if I work at least 20 hours every week for the first month (minimum in the contract is 16 hours), but I've recently seen ads for the same job but the bonus is now £350. My first shift is tomorrow evening but I'm wondering if there's a way I could go about asking for this 350 bonus instead of the 250? Sry idk how these things work this is my first job.