u/Unlikely_Dinner_1493

I’ve just been offered an interview at M&S Cutty Sark but unfortunately the job listing was only for 12 hours a week. I’m kinda desperate to get a job for this summer so i’ve just been applying to whatever, but i’d prefer 20-25 hours a week.
I used to work at Primark and there was a lot of overtime available every week - I used to be able to double my hours just on overtime alone. Is this the same at M&S? Will i be able to regularly get about 8 extra hours a week of overtime or is this unrealistic?