"The factory made and sold full Jotas, taking over from Slater."
sorry Paul I beg to differ (again, gets boring dont it)
Slaters never made Jotas, they added parts (not always the same parts) to the 3C and it got called 3CE, The factory then supplied the 3CE but without silencers, the "3CE" was stamped diagonally between the LAV1000 and the numbers between the stars on the chassis. The Jota never did have its own series of chassis numbers, they were built at the same time as other triple types.
I have seen with my own little eyes, (no I am not playing I spy here) on more than one occasion, crated Jotas at Slater's premises, having the plastic sheet of the crate slit with a very sharp knife and two hardly wrapped at all, Jota silencers, being pushed inside to lay in the bottom, for fitting by the supplying dealer. So they were sent over without the "silencers" they have been made in the UK (at that time) by more than one supplier, the Healey bros being one of them.
Malcolm Cox makes 100% pin point replica pipes and silencers currently
CLEM