You do realise that all that will happen will be a statement of condemnation from the PM and maybe a complaint will be lodged “at the highest levels”.
Sad to say—You are right—just a sternly worded condemnation is about all we will get—But I have no doubt some event will just happen—something we may not hear much about but will hurt Iran. The Brits are a clever and dastardly people—they make good friends and bad enemies.