The 1NT was a weak takeout, showing two or three of the other suits, less than an opening bid. 2♥ was pass or correct: West is known to have at least one major. The double for 2♥ was not alerted. 2♥ went three off for 800 and no matchpoints.
West called the TD and said he would have bid 2♠ if he had known the double was for penalties. 2♠ would quite likely have gone for -500, which would be all the matchpoints.
The alerting rules in England say
Quote
The rules for alerting doubles are:
(a) Suit bids that show the suit bid.
Double of these bids is not alertable if for take-out; alertable otherwise.
(b) Short, Nebulous, Prepared and Phoney minor openings.
Double of these bids is not alertable if for take-out; alertable otherwise.
© No trump bids.
Double of these bids is not alertable if for penalties; alertable otherwise.
(d) Suit bids that do not show the suit bid.
Double of these bids is not alertable if showing the suit doubled; alertable otherwise.
Doubles are also alertable if they convey a potentially unexpected meaning in addition to take-out or penalties as defined above.
In 5E2(a) and 5E2(d) the word show is defined as follows:
it is natural, or shows willingness, in the context of the auction, to play in the suit, or it is followed by two passes.
So, if 2♥ "shows that suit" then an unalerted double is for takeout. If it does not then an unalerted double shows that suit. Note that the previous auction is irrelevant in general.
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The double was intended and understood as for penalties. Should it have been alerted? If so, would you adjust?