Things I learned today:
Mail online pay £25 per standard photo - less if it's from an agency.
But a bit more than that if it's in the dead tree version too.
They once nicked two of my pics that I had supplied (free) to my local rag. I rang their picture desk, pointed out that they were mine, and they eventually coughed up a couple of hundred quid.
It makes a difference how far into the paper they're used (the nearer the front, the more they're worth), and also the size they print them.