Different categories of auction items conclude at different times.
Whisky.Auction lots end when no more valid bids have been placed in the three minute period before the scheduled or extended finish time.
If a valid bid is made in the final three minute period, then the auction time for that lot is extended to three minutes from when the bid is made.
Scheduled finish time: 8pm (current winning bid at 7.55pm is £105)
New winning bid of £110 made at 7.59pm, so auction lot extended to 8.02pm
New winning bid of £115 made at 8.01pm, so auction lot extended to 8.04pm
New winning bid of £120 made at 8.02pm, so auction lot extended to 8.05pm
No more bids by 8.05pm, so the £120 bid made at 8.02pm wins