Welcome quadkc!
The aircraft you are looking for is not that unknown.
It appears to be an Avro 504 - with over 10 000 copies built from 1913 untill the 1930ies the most built of it's time.
Judging by the Gnôme engine I would say this one is an
Avro 504 k
the most used WWI-type among all Avro 504's with more than 6 000 built.
Cheers
Aquilius