Ben,
AFAIK, for the TSSC scheme Insurance, FJ will only accept the TSSC valuation.
Unless you think your car is really worth a lot of money, you can do it all by post.
For higher valuations, more photos are better than just four.
For my Spitfire, I sent in about 30 photos - all printed on the colour laser printer in the office.
For the first valuation, this was sufficient - &163;4500
For the second valuation, both Bernie and Trudi had recently had an (informal) look over the car at a show, so were able to do the valuation by post,
with a pack of about 50 photos - &163;6300 - but if they had not actually seen the car, then they would have wanted to see it at a show to value
it for so much - and when FJ got the increased valuation, they upped my premium by &163;10
I suspect that you will be able to get a valuation at STAB on Sunday, and failing that at the SEM in May.