I'd recommend getting a compressor with a bit more power personally, something with at least 80 psi or something like this
http://cgi.ebay.co.uk/SMALL-TIGER-AI...item3369574fc1
as for the airbrush if your going to spend £40 on one i'd say go that little extra and get something like the iwata revolution (gravity feed) you can get them a little cheaper I think
http://cgi.ebay.co.uk/IWATA-Airbrush...item45fb8ec96a
but like I said i'd give Jon a call or pm him and I'm sure he would sort you out.