Dear noddy,
YOKOHAMA is doing a road-legal Semi-Slick tyre in 205/60-15: A048 (available at RTCC for example).
It´s told to be quite "tricky" in wet conditions and is the successor to Roadster Lightweights/LeMans62´s A032 Tyres.
Did you think of the current Roadster Sport´s 205/65-15 too?
Would be also interested in ANY (road-lagal!) trackday tyres!