After much deliberation, research, umming and ahhing I finally had the beast re-shod this weekend with Michelin Pilot Exalto's. The Yoko's managed just over 20k miles - I expect these to be at least 50% better (assuming I grow out of my 'roundabout thing'!! :rolleyes5 ).
Initial impressions are very good - Tyre noise considerably down, steering feels much more positive.
Nev