Part No 715 "What are they from?"

I have the very rear end of a fuselage, it appears to be a welded steel tube fuselage.
The only part numbers I can find on it are suffixed with H715, eg 5H715, 14H715, there is also a small inspection stamp that starts with RY.
Would this mean that it is off of an Avro of some type that was built at Yeadon ?, the H prefix would suggest they are fin/rudder & tail parts.
One Thought was that it might be Anson, but not sure what the part numbers are for it.

Any Ideas ?.

Bob T.