I've tried that, it does start me off in the right folder it's just that when I get there I still can't modify any of the files in it.
I've tried setting the folder to chmod 755 but that makes no difference.
I get a message saying 550 Permission denied when I try to delete or upload to it.
I'll try the <VirtualHost> idea thanks.
p.s. I actually use gproftpd too which makes changing proftpd stuff easier if anyone here hasn't heard of it.