What happens if you sell a property for more than the probate value?

wheeler1970

I did probate two years ago when my brother passed away, the house I live/lived in,when filling the forms in it asks for the value of said property which I based on a identical property on the next street which was £220k so I put that as the value of my brother’s, but I’m in the process of selling the property which has gone for 310k more than the probate estimate so does that mean I could end up paying tax on it, his estate was just the house he had no money so it hasn’t exceeded the £325k probate threshold.
thanks.