Lets assume rudder and elevator are right side up. The serial number could be X223 or XX223. After looking at close up it very well could be.
With curvature of letter or number previous to the first 2, it appears it could be a [B, C, D, 3, 5, 6, 8 or 9]. Possible combinations follow:
B223 - FK.8
B3223 - Avro 504J
B5223 - Sopwith 1F.1 Camel
B6223 - Sopwith 1F.1 Camel
B8223 - (rebuilt aircraft B8223 not listed)
B9223 - Sopwith 1F.1 Camel
C223 - Sopwith Pup
C3223 - BE.12
C5223 - DH.6
C6223 - DH.9
C8223 - Sopwith 1F.1 Camel
C9223 - SE.5a
D223 - SE.5a
D3223 - DH.9
D5223 - Sopwith F5.1 Dolphin
D6223 - Avro 504K
D8223 - Sopwith 1F.1 Camel
D9223 - FE.2b
E223 - RE.8
E3223 - SE.5a
E5223 - Bristol F.2B
E6223 - Sopwith 7F.1 Snipe
E8223 - Sopwith 7F.1 Snipe
E9223 - Avro 504K
F223 - DH.9 (not built)
F3223 - Sopwith 1F.1 Camel
F5223 - Sopwith 1F.1 Camel
F6223 - Sopwith 1F.1 Camel
F8223 - Handley Page V/1500
F9223 - Vickers Vimy
Assuming it is a Camel and tailplane is upright. Eight possibilities exist.
B5223, B6223, B9223, C8223, D8223, F3223, F5223 and F6223