how old are you now and what sort of job is it
spent convictions are not normally put on any CRB unless the conviction is seen to be relevant by person doing the CRB or supposedly if a police officer is concerned about the person and then it wouldnt appear on your copy it is attached to the requsting agencies copy under strict non disclosure rules
see
http://www.crb.gov.uk/Default.aspx?page=310
http://www.crb.gov.uk/Default.aspx?page=1871
there is also this section that the requsting agency can get
http://www.crb.gov.uk/default.aspx?page=1858
if you want to see what the form looks like see here
http://www.crb.gov.uk/pdf/crb11%20guidance.pdf