Interestingly, this is denied by the Iranians.

Regardless, Trump and Bibi started this war unilaterally. It's not gone as planned and now they want our support.

The only appeasement I've seen the UK do (repeatedly) in my lifetime is in kowtowing to the US and Israel.

Fallacious comparison, two entirely different situations. For a start, whatever the Iranian response, the aggressor at the root of this particular episode is the other side: the U.S.