Why?
(I doubt there was any kinetic UK involvement. we don't have much anti-ballistic missile capability - it's all on the T45 destroyers, and while there is one in the Med, it's a point defence capability, not a theatre wide one. I'd be genuinely surprised if UK involvement went further than radar picture from Cyprus and the RN in the Med, and signals intelligence)
Counter-argument: each successful Iranian missile strike in Israel pushes/pulls Israel towards a larger, harder retaliation. The less damage is done, the fewer Israelis skilled/injured, the less that Israel feels it 'needs' to teach Iran a lesson - not least because the 'lesson' is showing Iran to be unable to hurt Israel.
The April attacks are an example of this: huge effort by Iran, but minimal impact on Israel - Israel did retaliate, but it was relatively small scale stuff. Imagine how Israel would have retaliated if, instead of a dozen or so missiles getting through, a hundred had got through?