hi buddy you will have heard of the cheap o hk spy cameras well worth the money buy from hk there £4-£5 not the uk people want £10-£15 for them claiming there version 2 but theres only1 version.
http://cgi.ebay.co.uk/Mini-Car-Key-C...item20b7c4b06f
then all you need is a 1-8gb micro sd card for it
ive put a small home in the bottom of the case to put a screw thru to mount to my f1 car for a solid mount so can be dont to fit on helmet or body armor etc.