I wouldnt worry about you having signed the deeds in his sole name. Though on paper he is needed the owner of the house and the value of the house, but you might well be entitled to part of the equity. Factors that will help in your claim are: did you help pay the original mortgage? , did you pay any bills? , did you incur any other expenses with relation to the day to day running of a matrimonial home?
The only factor you have going against you is that you seperated a year ago and are now laying claim to equity. But as Plowter quite rightly points out, a good solicitor might well succesfully argue a settlement of the vaule of the property at the time of the seperation.