Hi,
I got up before the sparrows this morning to check real-time 'useable minimum' daylight. I reckon with clear skies he can get away at 0440Z, and 0455Z if overcast (like this morning).
So, extrapolating that further, makes an arrival in Southend of 1530Z - should be enough time to give him that punch and head back to the land of clogs
.
Safe flights, Sam.