MADAM – I recently submitted a bid online to an auction house in the US. I registered my bid which was accepted by the auction house, but in their reply they stated the actual amount of the buyer’s premium and taxes and then provided the total sum which I would be charged if successful.
This I found very helpful and then I wondered if the auction houses in the UK could do the same.
Furthermore, many upmarket auction houses feature a screen showing all the bid increments during the auction.