Well Brian
For what it's worth I checked the Air Britain Stirling File for those Stirlings being listed for 15 Sq within the timeframe given, but I cannot find any suitable candidate...
Then of course IF it was only damaged and could be repaired it will not be listed in this file since only total losses are recorded. I also think that to be listed by Chorley the aeroplane has to contain one or more crewmember either killed, lost or POW.
Good luck with your search
Cheers
Stig