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If you still have all the fixing and they are salvageable, it may well be worth considering a visit to your local livery stables and ask about leatherworkers in the area. That side of the work will be most expensive from a car restorer's perspective, but for the sadler it is bread and butter work.
If you are on FB, you will probably find this group helpful: TSSC Group[^] The group is very active and full of advice - in stark contrast to the equivalent MG group.
I'd be tempted to have a crack myself if the materials aren't too expensive - just do it on a hot day when the material is pliable and make sure it's reasonably tight. I know droptops are better off done by someone with a bit of experience, but this looks like a few press-studs (though mod this through the fact I don't know only had rag-tops).
I miss both my Spitties - they are as rare as hen's teeth around here and mahoosively expensive now, they used to be entry-level classics.