Your nephew should be shot. XK140s are *rare*.
It’d be like taking a pristine 1953 Corvette - and sticking a Toyota Supra motor in it.
‘Some years ago” was closer to circa 1973.
Glad to hear about Lucas and Whitworth. :)
Lucas, Prince of Darkness.
(although when I was a teenie bopper Lucas Flamethrower headlights were the best)