Haha, indeed it might be to avoid Dr. No's SAMs on Brecqhou.
Joking aside, I did wonder if there was something unusual happening the day I was there (it was the evening after the Battle of Britain display coincidentally) but I had a look on FR24 this morning and watched an ATR arriving from Gatwick and it also took a 'dip' to the south before lining up.
Apologies for what might seem a trivial question. Just taking advantage of the fact that there's not much going on on the thread