I'd have to do some checking, but the T10 2-pots are roughly £62+vat/pr less than the T20 4-pots. The discs are the same price as the 275x22 ones from the 4P107 kit, brackets/lines/bolts etc will be the same too. So including discs, about £380+vat maybe - excluding discs (lots of people will already have them!), about £325+vat. You also need lines which are the same price, pads are £35.94+vat for EBC Red, £45.60+vat for EBC Yellow, £34.18+vat for Ferodo DS3000, £32.48 for Ferodo 4003, £26.50+vat for Wilwood B10, £36.50+vat for Wilwood B20. LOADS more makes support the pad shape, same as the T20 4-pot pads!