Thank you Dave - I did expect both the silence (lack of anyone offering an aftermarket hardtop) and to, perhaps, hear from horror stories about fitting issues.
The factory used to have an old hardtop tucked up in the rafters and during more than one visit with Steve Morris, I used to joke with him about fitting it to a Trad for me. Each time he would give me a pained look and tell me how challenging they were to get fitted properly; needless to say, the conversation always moved on and the dusty hardtop quite possibly still remains where it did for many many years.