Another war in the Gulf, higher oil prices and general instability - The Military/Industrial complex will be rubbing their hands grubby together!
If it was that easy for them they would have found the excuse and be in there already, first time in Iraq they had Saddam who was effectively a one-man-band on a mission to invade Kuwait, that was excuse enough, they knew the force strength, or lack thereof, there wasn't big support from the Russians, the 2nd time public opinion had been swayed by the false dossiers on WMD and so were parliamentary votes, then Afghan/Iraq had the 9/11 terrorist excuse, hell they even went into Syria without consultation on the basis of a dictator and look how that has turned out, the latter 2 expeditions have turned into long wars with global consequences, pandora's box springs to mind.
Has the MI complex paused to consider Iran? They aren't steaming in guns blazing, the UK spat is not excuse enough, there just isn't the public support (as if that matters), nothing has gone through UK parliament yet (that matters not also), the UN and EU are quiet on the matter, despite the UK side being supposedly based on EU sanctions, whilst simultaneously denouncing Iranian sanctions (none of which makes sense).
The UK keeps trying though, boarding an Iranian tanker and sending unladen tankers through the straights with transponders turned off and Navy escort is baiting the Iranians, seems the Iranians are wise to it and went for laden unescorted tankers instead, what a daft tactical move by UKGov, either foolhardy or a clever tactical move to reveal something about the Iranians that is not being reported (at this point in time it looks like a miscalculation, however that could be a ruse).
Funny isn't it, how a release to the press of the ship to ship recording of the Iranians capturing the UK tanker was made, I wonder how that came about!