House law between spouce- England

Hi

I was wondering about my situation.

My wife and I have been living as friends for the last 10 years, raising our kids.

I am retiring soon and I intend to buy a motorhome and live in it.

My last child has gone to university this year.

I want to either sell the house and have my half, or she can buy me out of my half of the house. However, she can’t afford to buy me out, and she is refusing to sell. What rights do I have so that I can have my half of the value of our shared property? Can I force a sale legally?

Thanks