FTR in itself has very little little effect on the value of a Enfield. It does mean it was given a complete overhaul by military armourers while still in service. Thus an FTR marked rifle is still in original condition unless modified or otherwise altered by a private owner after it has left the service. An unmarked and in excellent condition will draw a higher price tag but two comparable rifles in typical good to VG condition are really going to sell for about the same. And price is definitely about overall condition. If the rifle's history is your appeal, then An FTR'd rifle is far more likely to have seen significant use in combat and not just sat in a rack on a naval ship.
PS. By your avatar I'm assuming Air Force. reg or reserve? My application is in for the armoured recce reserve unit in Medicine Hat.