The B2 is actually quite a rare car these days - it wasn't out for very long before the B3 was released (and many B2s were converted to B3s also) But despite this they don't seem to command much ££s - especially on UK ebay
My mate still races his B3 on occation on the grass track at Hinckley & it goes really well - the B3 only had some minor updates to the B2 so I don't see that it would go any less well?