Ok thanks guys, yes it all seems a bit too good to be true. He claims that he has reached his maximum monthly withdrawal limit from the site so can only transfer internally.
He was also willing to transfer the 1.62 bitcoin before I transfer the two domains (we made a deal for a second one which he wanted too!)

Yes thanks for that I had already googled them and got nothing and the domain was only registered this year but they are registered at companies house.

Thanks for confirming what I was thinking.

Cheers