Hope this helps a few.
Should have mentioned this before any sex offenders having problems with car insurance try the Post Office website,it asks you if you have any convictions and gives you a drop down list but this offence is not listed,say yes to a conviction and pick zzz from the list and then carry on to get your quote.
Rang them up to check my policy and was told I had notified them about my conviction and didn't ask what it was.
Been doing this for the last 3 years.
Good luck all