Not sure your motivation to register this but considering " Sir Bobby Robson Foundation, a cancer research charity" exists you could be treading on thin ice with this domain.
Registering the domain of someone who has just died and is an absolute ledgend to football ('soccer')?
Worth perhaps minus £x,xxx due to the potential of a lawsuit?
Of course, if you plan to develop it into a tribute website (and would be happy to donate the name to Bobby Robson's family) then that'd be an awesome thing to do.
But if that isn't your intention, why would you want to profit from someone's death?