Smudge ...
I recall the Wing Spar mod. I'll have a dig for you. Had you other specific mod's in mind ? Again I'll see what I have.
Longer Ron ...
The Tow Hook was installed during production and not a retro fit for the RAF fleet.
I'll come back as soon as I can ... I'm having an off-line conversation as a result of this thread in respect of an airframe already mentioned ... I'll post that first if I may ... Probably tomorrow now.
Cheers ...
Coff.