Thanks for all the responses.
I folded.
I just couldn"t see what he could have that I was beating, other than JJ and I thought that unlikely. It was the combination of his tightness and the LAGs still to act that convinced me that he wanted callers or even better for him, raisers.
If he"d bet £30 or less, I might have been tempted to call and set-mine, knowing that I could stack him if he did indeed have AA or KK - and hopefully I"d have another couple of passengers along for the ride.
But with the size of his bet and the size of the stacks at the table, I just didn"t think I could call. So it was either a re-raise, or a fold. A re-raise would see me committed, so it would have to be a shove really.
I just thought that it was too likely that he had me crushed, and looking back I think that I"d put him on too narrow a range - he might have done the same with TT or JJ.
Anyway, I did fold. UTG+1 called. The flop came 9-high, and the SB bet out and UTG+1 folded.
SB showed kc kh.
I wanted to get other"s opinions to see if I just got lucky, or if my reasoning was sound. I think it was a bit of both.