This time I'm fully conscious as South, and therefore didn't have the luck to bid the grand slam
How do you approach it? Interference is very heavy. Would you even suspect the possiblity of a slam existing?
EDIT: additional scoreboard note - this is an MBC hand. Nobody bid grand. A 6♥xx+1 bidder gets 14.9 IMP, 3 other tables get 6♥+1 and 2 gets 6♥, for 6.0 and 5.4 IMP. If you miss slam, you lose IMP. A sacrifice attempt of 4♠x-3 gives 1.8 IMP to NS.
PS: I truly dunno how one table could possibly waste this as 6♥-1, must have pitched the ♣A on facing a ♠ lead (jk of coz)...but that gave us better IMP...

Help

W N E S
1♠ 2♦ 2♠ 3♥
3♠ 4♥ P P
P
4♥S+3
Opening lead: ♠K
4.3 IMP to EW