oooooh i understand now. erm yeah i'd say it's not the best kind of thing experience wise or pay wise. if that's all the volunteer stuff you can get, then by all means but you'd be better working as an HCA. if you can't find experience, especially if you're not a school leaver, i know places can be a bit harsher with it, try some charities. i did some stuff with macmillan nurses that was really good and some local age concern projects. i also got quite involved with the stroke association. so that's something else to try. other things that i've seen people doing in my hospital at the moment is bringing tea round a&e. hardly glamorous but you do get to see quite a lot and it is much appreciated!!
but to answer your original questions, yes you can do it part time, it's GCSE level stuff they need, no they don't mind students doing it generally. but i think if you can get a HCA position that'd be better for you.