If you want to DIY, I suggest you get in touch with Tracee Walton at Amber's Hope on Facebook, as they are transporting dogs to the UK regularly, and will know all the regulations and should be able to make suggestions as to how best you might do this. Otherwise, http://www.airpets.com/
should help. We used them to bring our dog here, and found them extremely professional. Not cheap, for a large German Shepherd, but worth every penny as far as we were concerned. Good luck!