As a past owner of two Venom Clubman (both 1959) models, I can remember that a very good aftermarket TLS conversion was made by a firm called John Tickle, and this was emulated on the later Venom Thruxton. If you try advertising for a John Tickle conversion it might turn up what you are looking for. I have tried a DVLA enquiry to try and track down 472FTB, my last Venom Clubman, but can’t track it down !
Brian
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