Evidently he twitted "You let your dad down i hope you know that".
If there ever was something that should have been left to censure by other fans and friends and not made a police matter then this is it. This sets an all-time low in the threshold of free speech in the UK. If it sets a precedent how many other comments and posts will result in charges? How much normal conversation would be illegal?
This is also likely to be ceased on by groups wanting to suppress criticism; with "unkind words" being reported to police."