I wouldn't say that needing a heap of mods is particular to J41's when older aircraft are getting put onto the British reg.
Especially if they have been in the desert for a few years. I should imagine the cabins will be in a pretty poor condition.
And a fleet of 25 is over a quarter of the whole production run.
J41's have a reputation for being quite fast little ships, reasonably reliable and don't use much fuel. And as with all BAE products built like a brick
house.
Is the sim up and running yet?