It was definitely KLM751 as that was the direction the trail went, West to East. The trail was almost overhead but definitely to the South of my location.
Timing may be off. It may have been closer to 11:00 BST. I took the photo and went back in the house to show my wife who was listening to the Archers (if you are not in the UK that is a Radio 4 soap). She told me off for disturbing her

It is aired from 10:00 to 11:15 BST
The telephoto would have been set about 100mm.
If I'd known how much interest you guys have shown in this, I would have taken more notice - sorry.