Not sure about the overtime I don’t work there anymore. I think you can get it particularly at busy points but I wouldn’t bank on it all year round. They have some sort of system where you have to guarantee you will work 10 extra shifts and they pay you upfront or something like that though I can’t remember exactly how it worked.
Jeff it would depend which location you were working at but most afternoons would probably be trunking and start for afters were between 11am and 5pm if I remember rightly on rota so you would know what you were doing in advance.