You forgot some essential facts, Keith. Importantly, you assume that all vehicles were/are registered in the UK, plus that all LHD and RHD cars must be in the UK anyway. Makes a nonsense of those figures really.
Of the 152 ZT-Ts, 37 were LHD, leaving 115 RHD according to the MGR data.
Not all cars built for, and destined for, the "GREAT BRITAIN" market (yes, RHD and LHD), actually ended up by being delivered there, and vice-versa.
On top of that not all surviving LHD cars live 'abroad', and not all surviving RHD cars live in the UK anymore (quite a few I know of never did).
Finally, a few of both groups never escaped the factory at all, being development or crash testing vehicles, being intentionally destroyed shortly after birth!
.... Bit of a pig's breakfast !
So I'm afraid you can't really attempt to put meaningful percentage survival figures on it without lots more registration information, worldwide.
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