The bad news is that the laptop seems to be randomly rebooting and occasionally freezing. I haven't a clue why - it wasn't doing this before I handed it in for repair, and as far as I know nothing has changed software wise, so it has to be a hardware issue. The first (and so far only) freeze I've seen had the screen back light go off and a ghost image appear on the screen which freaked me out a litte, but the subsequent rebootings seem to happen at random.
I'm uncertain as to whether I should keep testing it this evening to see if it's a recurring problem - I think it's getting a bit better but that might just be my perception - or whether that's risking more damage and I should just wait and contact the techs tomorrow morning.
I'm more that just a little ticked though that there's a good chance I'll be missing my laptop for yet another week while I'm away over Christmas, with all my digital research notes (which I really would like to have right now!) and my ability to work with Flash.