searches don't reveal too many choices. Which , where and how much? Your thoughts please....

Have you tryed www.camskill.co.uk , toyo t1r's would be my choice .

The issue with this tyre size is it's not that common. This means the tyres which are available are often of an older design, like the Toyo T1-R's.

That said if you don't do many miles per annum consider Yokohama AD08R's, these are semi slicks which have superior dry and wet grip over the Toyos T1-R's.

...or try searching for the alternatives:
- 205/50/16
- 215/45/16

try this

link