Very little. I might start with fligen, it looks like he might have a lead on Deprived's IRL ID-
Not trying to discourage you, but I tried fligen a couple of months ago and got no reply.
This is what I have gathered from a few different sources (I don't know them so I can't vouch for them).
Deprived is known IRL as 'Jon W'.
He has done work in the UK as a forensic expert (i.e., in court as an expert witness on IT matters).
I've tried asking someone who works in the forensic expert field in the UK if they know Deprived. He said he'd heard the name but didn't know him personally. He said he'd ask around but I haven't heard anything.
We could do worse than make a list of leading forensic expert companies in the UK and approach them for any leads.
I've got a throwaway email address for him I think I posted here a while ago - [email protected]
It would be a last resort but if nothing else works we could try getting a subpoena for Google to look at the address and see if there's any identifying information in it. It would cost a bit, though.
Anyone who is in the UK and wants to take a crack at this with this info is welcome.