Tried PMing you (hun xx) but your inbox was full. Would rather not divulge source here but is one of the very few things I have any level of ITK about. I'd say the source 80-90% checks out.
TB probably has a fair idea. Therefore, a few of his close friends and business acquaintances probably have a fair idea too.
*COUGHS*IT'S A LOT LOT MORE THAN £1BN *COUGHS* Sorry...something in my throat...