This is blatant breach of copyright and they know it so the only issue before any court would be quantification. They are clearly not wanting to pay you what you've asked but as that's the going rate per NUJ, that's probably what a court would award. I would stick to that figure or go down to £1250 for immediate settlement but anything in the low hundreds is insulting. Happy to discuss. I hope that helps. Please leave a positive rating so that I am credited for my time.
The court's decision would be based on what you would expect to get had it been a commercial arms length transaction so an "industry standard" price. You wouldn't get damages for not being asked for the pictures but at the same time the court wouldn't in all likelihood allow them to argue that they would have negotiated a fee as no opportunity was given because they effectively stole the images from you.
Yes you could, but you may have legal costs to pay, unless you have experience and know what to do in court and decide to run the case yourself.
You're welcome. Do t forget to leave a positive rating on the system so that I am creditd for my time.