... unless you've been in them yourself? Otherwise, isn't it just anecdotal and likely to be exaggerated?
I was speaking to a friend who has been for drinks a few times in central London, and he said that it has been pretty quiet each time and most people are sitting outdoors, etc. But because of the pics of Old Compton St on the first night, everyone reckons it has been packed ever since!
Of course, if you've been in them and they are jam packed, then you're one of the people jam packing them 