An update. This morning I bought a single Honda 16" OEM alloy (as currently fitted to my car) from Cox Motors for £169.99. I also ordered 4 VREDESTEIN QUATRAC 5 tyres at £84 each with a local garage happy to fit for £10 a corner. My plan is to use one of the wheels/tyres currently fitted to my car as a spare (Cox Motors ensures me it will fit in the boot) with the new rim and three other current wheels being fitted with the VREDESTEIN QUATRAC 5's. With this combo I should have 4 new all season tyres to drive on and a full size spare with DUNLOP summer tyre ready to go in the boot. Thanks for all your advice, it really helped with my decision, a great forum!