Thanks all for confirming what I had suspected. Pity I had no idea. Best form of retaliation I might be able to muster could be a poor google review but even if I don't at least I can go look for a trustworthy mechanic for the future. That's a terrible amount of money to overcharge.

I've been looking at this one, any thoughts?
https://www.totalcare4wd.com.au/

Paddy