10 Downing Street is currently beta testing an online petition system that allows UK citizens to create petitions on any subject that they see fit.
For example, there is a petition to end unfair trade barriers against developing countries and abolish the CAP (Comon Agricultural Policy), which has so far received 394 signatures.
However, there is also a petition to replace the British National Anthem, “God Save the Queen” (a hymn of unknown origin dating from about 1744), with “Gold” by Spandau Ballet (which reached number 2 in the UK national pop music charts in 1983). This petition has received 215 signatures so far.