Should have added that I reset the fault codes, done a few K, and no new codes have appeared since I filed the contacts. Does anyone recon I need to change the relay (or whole relay block if I can't get just the relay on its own) or will what I have done be ok if no more codes show up.

I can get a new one from the States on eBay for $250 delivered to Oz but don't want to if not needed.