S&DJR Engineer's Department long wheelbase 4-wheeled wagon No.1242

I have located this photo at Glastonbury, with difficulty as Flickr maps are still spooked by entering 'Glastonbury' in the search box, because 1242 has 'To be returned to Glastonbury' on the solebar above the far wheel. There looks to be a large brick works in the distance. If someone can confirm its existence in the 1920s that would help to confirm this location.
The date is pure guesswork. Someone who knows about the numbering of the Derby photos could probably help pin that down more accurately.
This photo also appears in Atthill's Picture History of the Somerset & Dorset Railway.