Hi James, not in the UK yet, plans were postponed
As for the stories about demonstrations, one name I think many will bring to mind is the sucess of Tohei Sensei in Hawaii. I read today his account of that first visit, when plans had been made for challenges after he'd accepted, and then they told him of the plan. He considered not going, but felt he'd already committed himself, and said "I am going in order to teach the principle of non-dissention. So I cannot challenge anyone to a match. If they want me to fight with professional wrestlers, let them challenge me. Master Ueshiba would permit me to defend myself."
I think there is a difference between demonstrating your art, and choking someone silly to win a contest.