There also seems a great inequality in the event rules as I understand them. Much of Surrey is within 20 miles of a lot of central London, and it seems that if a London event is organised first then I cannot organise an event in Surrey, unless I find a venue more than 20 miles away. But if I organise an event first, then there is nothing to stop a London event that takes place at the same time being organised later.
Although I understand the reasoning behind the new rules, 20 miles seems an excessive distance limit. As has been said, a lot of tourist events do get organised in London and it does seem that this distance rule could have a major effect on what we can do locally.