The Right Honourable Professor Sir Robin Jacob, Retired Lord Justice has never been, nor ever will be a Federal Judge.
He is British, and his tenure as a judge was served in the United Kingdoms.
As to your list:
1) He is currently a professor at University College London (thanks Wikipedia!). It is fairly common for professors of law to also work in that field: Alan Dershowitz is a full-time professor at Harvard, and I once took a class with a professor who was, at the time, representing a man held in Guantanamo (IANAL, it was an intro class).
2) Yes, it seems safe to say he is at least partially literate. What exactly do you think he would write about, and who exactly do you believe would pay him to do so?
3) Again, yes, safe assumption. Who would he speak to? What about? Why? Who would pay him to do so?
4) He's in his 70s, and has already performed many decades of government service by working as a judge. Why would he do this?
5) Again, he's in his 70s and has been working in law for his entire adult life. What field would you expect to see him in?
6) The man is in the IP Hall of Fame (not making this up, check Wiki!). Do you really think that there are going to be many companies who care about his expertise and have not been directly or indirectly impacted by his decisions?
7) Why would he do this? That sounds like the sort of thing a shark trying to build up a law firm should do... this is a VERY respected retired judge.
8) Fair enough... though again, no Federal benefits will be going his way (the UK government probably offers benefits too, though).