democracy
corruption free politics - or at least a massive hooha when corruption is exposed, unlike in some countries where it is taken for granted
freedom of the press, within reason
broadly Christian based legal system (for historical reasons)
respecting people's rights to their own religion - not imposing your own views on others too much
not tying up the legal system to one religion's views (though the whole gay marriage compromises 3 way bind on CofE have rather stretched that)
not talking about money, religion or politics at dinner parties
sometimes appearing to care more about animals than children
understanding pantomimes
saying sorry when someone bumps into you
Other countries can share British values, but some aspects of some other countries are not British.