They have this discussion frequently on 28dayslater.
It seem's the press think that because obtaining some images are on the dodgy side of legal, that publishing them without permission is fine.
But the guys from 28dl, always follow up any pictures of theirs that have been published anywhere without permission and send invoices with a 28 day to pay clause. If there is no forthcoming payment, they will and have gone to the small claims court and always win.
A guide to what you can charge here
http://www.londonfreelance.org/feesguide/phonlrat.html .
If your pictures have been used anywhere without your permission, then send an invoice. You are well within the law and within your rights to do so.