I had to get a CRB check done recently because I work in schools.

I was very worried about the thing as I was busted years ago (1978) for posession of a tiny amount of very poor quality grass. I also had a record for walking on a motorway (bad hitching technique)

I even spoke to the head mistresses of the schools about this because I thought I might loose the jobs.

In the end, there was nothing to worry about. Both the convictions are "spent" and my CRB certificate shows me with an unblemished record. Phew! Quite a relief.

I hope it goes as well for you jOhn / guest. Go to the citizens advice if you are still worried about it.