The only remotely conceivable way that the UK would have of projecting significant power onto the Moroccan mainland is by trying to foment a civil war. Otherwise they would not get anything out of it.
If the US even allowed the UK to do such a foolish thing, it would be disastrous long-term for the whole of Europe. Completely alienating and breaking off with North Africa means that Europe is now completely surrounded with unfriendly countries.