That sounds just like my experience, and I see you're Welsh as well - Cardiff and Vale by any chance? If so, I guess we've probably done 'special' shifts with the same patients, haha..
Either way, it's a fab job OP: I work for the Nurse Bank and get paid around £10/hour overnight and on Saturdays, and around £7/hour the rest of the time (I don't work Sundays, but if I did I think the pay would be around £12/hour - same goes for bank holidays). Besides the regular personal care duties (washing, feeding, aiding patients to the toilet etc) I also perform observations (blood pressure; oxygen saturation; heart rate; temperature etc), ECGs, enemas, suctioning and BMs (blood-sugar tests for diabetics) as well as changing feeds, dressings, colostomy bags, catheter bags and so on. Aside of that, the job also entails preparing dead bodies for the morgue, 'special' work (where you work as an individual or as part of a team with just one patient) and assisting senior nurses or doctors with more complicated procedures such as sigmoidoscopies, cannulation, catheterisation and so on. It's not complicated in the slightest - it's actually really good fun a lot of the time, and gives the opportunity to pick up a huge amount of knowledge, if you're observant. The brilliant thing about working for a Nurse Bank, too, is that you get to work *everywhere* - I've been in theatre, A&E, post-surgery, neuropsychology, rehab, mental health, even an 'infectious diseases' unit, where everyone is barrier-nursed... basically you name it, I've worked there. Which is fantastic if you're looking for broad work experience.
I was 19 or 20 when I started doing it, and am now just about to turn 23.
Hope this is of some use to you!