I assume it would be considered an act of war for EW aircraft based out of Cyprus or elsewhere to run "exercises" off the coast of Libya?
they can certainly do it just outside the EEZ and that would still allow them to see inside most of Libya
I would imagine that there would be a few satellite adjustments happening over nth africa at the moment to maintain a watching brief over southern libyan military units. everything that transmits in Libya would be getting attention from any number of militaries, I imagine that the Italians, Saudis, Spanish, Americans would be ears up.
But yes, only realistic solution at the moment is to fly people out or ship them out on ferries. Would diplomatic staff be organising for foreign nationals to be transported to the airport or ports or would they have to attempt to make their own way?
I imagine that it would be chaotic and that this would be an ad-hoc issue, although there was a view that there was an "middle eastern iron curtain event" scenario evolving, I really don't think that anyone suspected that this would happen so quickly
if there are any contingencies in place they would be a legacy of planning for egypt.
On that basis, UK probably has sufficient resources on standby, but again, the fastest way to move is get people out by air - ships in volatile environments are attractive targets, so you only bring them in if you have sanitised and secured the space (another specfor role) BUT, putting armed troops in another countries space without permission is an invitation for them to regard it as a hostile act and start invoking the Berne and Hague Conventions etc....
walk softly, get your people to the airport and fly them out while all the local chatter is pre-occupied and hope that this idiot does not start targetting all civilians and accuse them of being spies etc.....
this bloke is already unhinged, I'd be getting people out as fast as possible before he completely derails.