The same thing as with the occupation, the settlement enterprise, the Gaza blockade, etc;. Western nations object to Israel's behavior in these regards, but their attention span is short and their objections are not meant to be taken seriously. This is why the subject recurs on a regular basis just to be put on the back shelf once again. If the Brits are serious about not wanting the Mossad to use their passports ofr espionage, then they will place travel restrictions to and from Israel to begin with, and set some sanctions in place as well. If all they will do is the same as before, better to do nothing and save the embarrassment of being taken for a stooge.
British Airways flight diverted to Canada after bomb threat (AP)