On the arrest photos...
"Despite a 2012 High Court ruling that said keeping images of presumed innocent people on file was unlawful, the government has said it isn't possible to automate removal."
DELETE FROM p
FROM
Photos p
LEFT JOIN
Convictions c
ON p.PersonID=c.PersonID
WHERE c.PersonID IS NULL
There. Done that for you. Where do I pick up my £1.5m?