So, reasons to be proud of UK include protestors, the NHS, the BBC, more protestors, freaky kids' books, multiculturalism, Ken Loach films, angry songs, Tim Berners-Lee and James Bond (not in that order). All of which I would agree are absolutely fantastic.
...And then the world outside the stadium reminded us that reasons not to be proud of the UK include protestors being arrested and Tories whinging that multiculturism is leftist. So we've still got work to do, starting with electing a government that fits the Britain Danny Boyle showed us.