The brackets can only mount in one position, the disc does bolt to the hub ( goes to garage to check fitment of disc ) I hadn't noticed ( or realised ) before but there does appear to be two ways to bolt the disc to the hub. Guess which way I bolted it

It looks like by bolting it to the hub the other way round, the disc will be about 6mm closer to the caliper bracket.
I'll give that a try and report back.
Thanks Blue, your knowledge and ability to think things through logically may have solved the problem
