Hi Gareth,

Whatever you're most comfortable with, to be honest. Never take a risk. The absolute best way is payment directly into your bank account, only releasing the car when payment is received, but not all sellers will agree to that. Cash is fine if you're happy to handle a large sum - and desposit it in your bank account quickly. A banker's draft is good, but these have been known to be forged, so try to get the seller to agree to waiting until you pay it in.

Whichever method you agree to, consider your personal safety at all times, insist on getting ID from the buyer (nobody reasonable will refuse) and don't relesae the car until payment is fully received.