help settlement advise x

please could somebody advise me on the following info;- my house currently on market would hope to get £625K on the property mortgage is £410K endowments are £77K i have 3 children havent worked in donkey years ex has always had great job with loads of money i have done my research and will need £250K to rehouse myself and children 17,13 and 7 boy, girl boy, none can share in view of ages and sex. 250k would get me a 3 bed convert or small 4 bed in relatively good area my solicitor is pushing so that i get 250k to rehouse, but also saying there could be a call back where he owns a % of this which im not happy about but this could be the scenario also we trying for spousal maintenance because i have medical condition which will affect my future job prospects what is the likelihood of this happening ? x please advise

Sounds like reasonable advice from your solicitor as far as I am concerned.