Your ar5e fell out, you admitted so yourself in the title of the thread..!
You didn’t read the auction terms and conditions then backtracked - they quite clearly state that they act for the vendor and it’s up to the buyer to do their homework before bidding.
The way you talk about “consumer rights” and your general tone around “your rights” I’d suggest you might want to stick to buying from a dealer; at least they build the cost of “buyers remorse” into their business model.
I think you need to read the entire thread perhaps, as there are answers your own points raised. I'll buy from whoever I feel comfortable buying from thanks buddy. The auction company and I parted on good terms, so alls good.