Brits in Salonika isolated?

[TheDoctorKing]

A detachment of British V army was transported last turn to Salonika. We have right of passage from the Greeks - in fact, according to the diplomatic display, we have full access to Greek territory, not just Salonika. The French did their option to land their army there this turn as well. The French are in supply but the British are not. Any ideas why? The Turks are still neutral and there are no Central Powers naval units around.