Forty-years ago, four activists met in a Warwickshire pub to start the Green Party. Now they have their first MP, and today more than a hundred members have arrived at their Spring Conference in Nottingham.
At two o'clock this afternoon, their new leader, Natalie Bennett, will address party members at the East Midlands Conference Centre.
She told ITV News Central that there are three key policies she would raise in her speech.
Conference will last four days, with a 40th birthday celebration tomorrow night.