1) What I can see is an air-cooled V8. More like 70/80 hp Renault rather than R.A.F.1a.
2) Also, Royal Navy personnel around the wreck.
3) There is a structure which reminds me horn-balanced rudder or elevator.
Now the problem is how to find an airplane which fits
I am going to start with Airco D.H.6 prototype.
Regards,
Yavor