During a visit to Jerusalem Cameron seems to have conceded that the Israelis are going to respond. The idea they would let it slide is for the birds, it was only the direct intervention of US (and some UK) assets that prevented far more damage on the ground.
The Israelis will never be more prepared or (in their estimation) justified in going after Iran’s nuclear programme, the only truly existential threat it faces in the region.
We’ll likely find out soon enough which way this is going to develop.