Lib Dem

Green Party co-leader Carla Denyer told the BBC the guidance puts trans people at risk of discrimination, while Lib Dem leader Sir Ed Davey said there were questions over enforcement.

The Lib Dem leader said his party accepted the Supreme Court ruling but there needed to be more debate in Parliament to reach a clear solution that "respects people's rights".

However, without government support the Lib Dem proposals are unlikely to become law.

Mike Ross, the Lib Dem leader of Hull City Council and candidate for Mayor believes his party is best placed to scoop up votes.

Lib Dem Oli Henman and Green Party candidate Mary Page see themselves as the closest challengers to Labour.