In reply to henwardian:
If you can spend up to £500 get a RX100 M3 -
f1.8/24mm lens
24/25/50fps @ 1080p
120fps slo-mo (albeit at 720p)
Time lapse Apps in camera which work really well (similar to Magic Lantern)
It's tiny so you're more likely to bring it out to the crag with you (a big plus if you're an amateur where climbing comes first)
I haven't done much with it so far but what I have used it for I've been really impressed with.
It also takes pictures I hear.
negatives being -
It'll only record for up to 30mins/4GB as per all other stills based cameras, video cameras will always have this over on them.
It's not a DSLR
Sometimes it feels too small, like you can't a grip of it, so I bought a grip, and gripped it
good luck to you and happy filming!