I'm guessing the springs on the Spec B are progressive as seen here:
I may well send my old set off to be fettled and see what comes back - I'll still have the new ones to replace them if all else fails. The only issue I have is that the standard spring compressors will not compress the springs enough!
__________________
2005 Spec B 6MT - KiDO tuned (~270Bhp)
Custom exhaust - Cosworth filter - Samco Intake - Tints - Bilstein B8/B6 & STI springs - SuperPro ALK - Whiteline positive shift kit, rack mounts, rear adjustable camber bushes, front ARB mounts & strut brace, 20mm rear ARB with AVO mounts, - Hardrace Gearbox and pitch mounts - Prodrive PFF7's - Front Brembos - Kenwood CarPlay - 1/2 carbon grille - STI front splitter