Still can't find the serial of Clint's SE but I think this is London Colney (as suggested elsewhere), the buildings on the right being the 3 permanent wooden hangars (called "Flight Sheds") with flying field to the left. There were 3 temporary ones to the west and the trees in background were woods. The photograph is labelled St. Albans, only 4 miles away.
The airfield photo is not dated and is not quite orientated N-S. The field was originally "Shenley" after the nearby village but changed as being too similar to "Kenley".
SE5as were in use for training (41 TDS ?) in late 1918 with guns removed.
https://www.iwm.org.uk/collections/i...ject/205354034
Nick