I seem to recall a flight leaving LCY on Sunday night (BEE477), holding over the EGJJ area for a long period, and then returning to LCY.
In fact, the poor controllers at City could have all had a late (22:30) stay that night waiting for the possibility of the fog lifting and the DH8 departing for JJ, but were saved by the fact that JJ closes fairly early!
At least they gave it a go!