Thanks for the reply - appreciate that!
Been looking around today and think I have decided to go for 20mm in the back and add the 10mm's I already have on the front. So now on the look out for some 20mm's with the longer bolts preferably in black finish as my front 10mm ones are black finish! Don't suppose anyone knows where I can get a decent pair in black 20mm's??
Look forward to seeing your pics!!