Welcome to the forum
If you can hang on until May 09 for your purchase it would be worthwhile as the Stoneleigh kit car show is on the bank holiday weekend and there is usually a big turnout of MK Indys, so lots of owners to seek advice from. ( and maybe one or two looking to sell )
Best bet re insurance is just to ring round them all with your details and see which is best, just like you would with any other car really. Tis very difficult to say which is best as everyones circumstances are different.
Wet weather gear shouldn't be a problem as it's only a locost 7 style kit after all. The only thing I would say is that a lot of owners seem to have opted for the windscreenless look in which case weather gear would be a problem, look hear
http://www.madabout-kitcars.com/136/136picgallery.htm
not many with a full windscreen.
Cheers, John