Partner and I are mid/late 50s and thinking about living together. I work full-time and he has his own very successful business. Partner rents with rent at £700 a month but has £100k in savings (is 60 this year so no chance of a mortgage). I own my house (£210k) outright. If he moved into my house he would immediately be £700 better off and we would split bills etc - but I wouldn't be massively better off like he would be. What would be a fair way to do this - I don't really want to ask him for rent!