So, it is Northampton, not Peterborough.
Must admit I have never seen the term "real estate" in an old Will before - I thought it was a 20/21st century American term!
It might be worth looking in Northampton newspapers for the following few weeks, to see if there are any "auction" notices. I know for one of mine who had a bit of property, there were "for sale by auction" adverts in the paper, saying it was being sold by the executors of XYZ.