If you can find a B12 kit with Eibach springs you can use that. You don’t have to buy them from the club.
Just spoken to Euro car parts in Hull
Apex springs available to order apparently at about £81.00 plus vat
2-3 week delivery lead time
I spoke to a chap called Julien on 01482 487474. I told him about C1 Racing, if you ring him tell him I sent you.
(I use ECP for my Lotus parts supply business)