I realise, of course, that when canvassing opinions in a UI case one is supposed not to mention the UI, but when one asks what call you would choose after partner bids Blackwood and signs off in 5, it is blindingly obvious what the problem is. So apologies for the breach of protocol.
Love all, teams of 8, Tolle (X-IMP) scoring.
The auction (with silent opposition) is
1 - 2 - 2 - 3 - 3 - 4NT - 5 - 5 . 5 showed 0 or 3 Keycards for spades (clearly 3 by a reversing hand).
Are you inclined to allow S to overrule N's captaincy and bid the slam?