Have a word with your solicitor/conveyancer.
Who is currently deemed to be selling the house? You or your mum? If you are named as the seller- and when all is said and done, you'll be the one signing on the dotted line.
As long as the sale money is declared ( should the worst happen) I cannot see that a physical property, or the value of it makes a great deal of difference.
The only downside is, a probate valuation of a property is often lower than a market valuation, hence your IT liability is less.
Thank you Jessbow. Me and my brothers names as POA for Mrs ...... are deemed to be selling the house. Thanks for taking the time to reply