Gotta thank Rockport for drawing my attention to this with a post a while back - made use of it now.
Elite in Rainham have Eagle F1 GSD3s in pretty much all sizes, dirt cheap.. beat mytyres and the prices include fitting and balancing.
Very impressed with the tyres too, been on a couple of extended drives to scrub them in and they seem to stick like shíte to the proverbial blanket, with nearly no tramlining, even when compared to the 185s I drove there on.