Finally made a decision - Wolfrace Assassin 17"x7J rims with a 42mm offset and 205/50 R17 93 tyres. Every thing appears to fit with no rubbing on either lock in both forward and reverse. Off the GPS I'm doing 29mph when the speedo is reading 30mph so alls good there. Tyre noise is defo much quieter but then the new Goodyears are 69db rated anyway. I don't know what the noise rating for the replaced tyres is so it's impossible to say how much, if any, of the reduction in road noise is due to the change in tyre size. I can't say that there is a drastic improvement in handling and ride but the ride is certainly smoother and the steering feels more positive somehow. The whole thing just feels more 'sure footed'. I've posted this update and photos in case the info may be of help to someone else who is looking to change their wheels. I certainly appreciated the bits of information I found on the forum and internet.