You can't know what the actual bid was - say you bid £40, the winning bidder might well have bid £63 but their winning bid would still only be a little more than your maximum.
The best advice is the old advice, bid the maximum amount you are prepared to pay.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)