Via Benet Wilson, Snoop Dogg will again be permitted into Britain. Wikipedia explains the history

On April 26, 2006, Snoop Dogg and members of his entourage were arrested being turned away from British Airways’ first class lounge. Snoop and his party were not allowed to enter the lounge because some of the entourage were flying first class, other members of the party were flying economy class. After the group was escorted outside, they vandalized a duty-free shop by throwing whiskey bottles. Seven police officers were injured in the fracas. After a night in prison, Snoop Dogg and the other men were released on bail ..On May 15, the Home Office decided that Snoop Dogg should be denied entry to the UK for the foreseeable future due to the fracas at Heathrow as well as his previous convictions in the United States for drugs and firearms offenses.

Lesson: the lounge dragons can deny you access to their facilities and the country. Or… know your lounge access rights, bring a printout if necessary, but don’t attack the police just because you aren’t entitled to lounge access.