Here’s a poll to give one pause. Britons were asked about the hostage situation (I was going to say “crisis”, but, given public indifference, that hardly seems the word) and they responded as follows:

7% favour preparing for military action at this stage
26% want Britain to apologise and ask for the captives back
40% back the government’s position of continued diplomatic action stopping short of an apology

Countries that don’t mean it shouldn’t be in war zones. Only seven per cent of Britons mean it. Iran understands that.