GLASGOW, SCOTLAND - SEPTEMBER 14: Head of Policy at Scottish Wildlife Trust Dr Maggie Keegan (L) and Cathkin Marsh Project Officer Laura Cunningham (C) show Deputy British Prime Minister and leader of the Liberal Democrats Nick Clegg around Scottish Wildlife trusts' Cathkin Marsh Nature Reserve on the first day of the Liberal Democrats Autumn conference on September 14, 2013 in Glasgow, Scotland. The Liberal Democrat Autumn conference begins in Glasgow today where the leader Nick Clegg will address the audience during a rally this evening. (Photo by Dan Kitwood/Getty Images)

GLASGOW, SCOTLAND - SEPTEMBER 14:  Head of Policy at Scottish Wildlife Trust Dr Maggie Keegan (L) and Cathkin Marsh Project Officer Laura Cunningham (C) show Deputy British Prime Minister and leader of the Liberal Democrats Nick Clegg around Scottish Wildlife trusts' Cathkin Marsh Nature Reserve on the first day of the Liberal Democrats Autumn conference on September 14, 2013 in Glasgow, Scotland. The Liberal Democrat Autumn conference begins in Glasgow today where the leader Nick Clegg will address the audience during a rally this evening.  (Photo by Dan Kitwood/Getty Images)