This hand caused some ill-feeling at a local club, at matchpoints, and also showed the EBU alerting regulations in a bad light. East asked about the Four Hearts bid, expecting it to be natural when he would have made a takeout double, but when he was told it was a transfer to spades he passed. West led the ace of hearts and gave his partner a heart ruff with his lowest heart. East underled the ace of clubs and a further heart promoted the jack of spades for one off and a complete top.
South was not happy. He claimed that West had worked out that his partner must have a takeout double of a natural Four Hearts, and had used the UI. East claimed he had to ask, as bids above 3NT were not alerted. West thought the AH was a normal lead, as there was a chance his partner had four spades, and it might be necessary to get his side's tricks quickly.
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