Done a little googling around...the GR 3 used for the yeovilton 'FRS 1' was XV760.
The nose still survives and used to be owned by one of Dunsfolds 'photogs'.
Istr the guys grafting the Shar nose on used an external butt strap around the fuselage but cannot find a close up photo of it...it may have been 'contoured' before paint anyway.
regards LR