Can he make me sell the house at a price that i don't agree with?

I have a house with my ex. We have been divorced just over a year , we were married 21 years. We both have to live there, I tried to live away but I couldnt afford half the mortgage and a rent so I had to return. He wouldnt move out . My children are 24 Years and 20 Years old both at home . The 20 year old is on an appreticship earning just £50 a week so he cannot afford rent until it is completed and his pay goes up. The eldest has got a job abroad after finishing his degree. I therefore have to rent a 2 bedroom house or flat after selling this property to house myself and my son. There is not enough equity left in the property to buy again however to afford a rent for a 2 bedroom property I have to pay off a loan of £3000 to reduce outgoings . I then have to afford a deposit and other costs that go with starting to rent a property , I will also need some furniture as we will have to split the furniture equally. We have had an offer on the house but it is not for the amount I need to afford the above.I refused to sell on this offer . I have explained to him why but he wont listen and says he is going to his solicitor to force a sale. When we were married we took out 2 pensions in his name . The first was a pension mortgage . We stopped this after about 3 years as it was not going to pay the mortgage. Then 2 years before we split up he took out another pension with his work. We both agreed to this as we couldnt both afford a pension and we did everything from a jointly and his wages were then reduced and his name was on the pension.However the mortgage and deeds are in joint names on the house. I have been told I am entitled to half of the pensions and he can buy me out. I have offered this as a way forward so we can reduce the asking price of the house and get a quicker sale . I can then still afford to rent a 2 bedroom place. He wont hear of it and wants still to force the sale of the house. We both work fulltime.