Thanks for your local knowledge, kcockayne and Wycombe
Might just be a series of 'one-off's' as you say. The ATR72 I followed on FR24 this morning - AUR603 was the one I tracked - went directly overhead Sark on it's journey south so I'm guessing it's nothing to do with that. On the evening after the BoB display there were several arrivals that went south of the centreline so that may have been something to do with airspace restrictions still in place.