The Guardian has the story:

The 10:10 campaign to encourage Britons – and Britain – to cut carbon emissions reached the seat of governmenttoday, with a public call on the Palace of Westminster to sign up. Simon Hughes, the Liberal Democrat energy and climate change spokesman, wrote to John Bercow, the Speaker of the House of Commons, to ask for his support.

The paper quotes from Simon’s letter (which I can’t find online at the party’s website):

I am sure you will agree that taking action on climate change is not just about government policy. It is also about individuals, organisations and employers at all levels taking responsibility … Given the importance that Britain sets a global example on climate change, I believe it would be fitting if the Palace of Westminster and the parliamentary estate joined the campaign.”

And Simon isn’t alone in championing 10:10:

The Welsh Liberal Democrats also called last night on the coalition Plaid Cymru-Labour Welsh government to join the growing campaign. Mick Bates of the Welsh Liberal Democrats said: “The 10:10 campaign sends a clear message to the Welsh government that the One Wales target to reduce carbon emissions by 3% per year from 2011 is simply inadequate.”