Hello,
Currently on ebay is a photo of Avro 504A 7737. Thought I'd post it bearing in mind Nick's comment on the W2 under the cockpit on a DH.9. Most of the script on theis aircraft seems straightforward,but T.A. ? Also is that a camera on the lower wing or perhaps something else?
https://www.ebay.co.uk/itm/335602060...Bk9SR9KqyJTMZA
Regards,
Clint