zoe o'connell , 37 , is bidding to become britain 's first transgender mp .
lives in a three-way lesbian relationship with her two canvassers , sarah brown and sylvia knight .
ms brown , 41 , and ms knight , 39 , were once a straight married couple - when ms brown was a man .
parliamentary candidate for maldon , essex , said : ` we 're in a relationship and we 're not ashamed of that '