Hi Matt
After fitting my blockleys I found I had 'fiddle' with one of the mudguards to move it slightly away from the tyre as it was rubbing slightly on heavy cornering.
Try running a finger up the lower inner side of the mudguard , with you finger in the gap between tyre and mudguard. On mine there was a small round headed pip which I assume is a weld which was causing the issue. Slackening the mud guard bolts, especially the small horizontal support on the inside, getting a friend to lean against the mudguard then tightening up got enough back to stop the rubbing. Just something to watch out for as I was not aware of the rubbing until I noticed a track forming on the tyre.