It will be the solicitor
Thank you Dawn, that is what I thought.
This is an intriguing case as I think the deceased lead a double life. He appears to have had three children by another woman although his name does not appear on any of the birth certificates. The Electoral Registers suggest he kept the woman in various flats in West London, until she and the three children appear in a house near to Heathrow - or Heston aerodrome as it then was.
It is near impossible to prove a connection between the deceased and the other woman as he seems to have been careful to keep his name away from any paperwork, although I am hoping he decided to purchase this house rather than keep paying rent. If it is who I think it was, he was wealthy so the cost of a modest house in West London would have been small change to him.
The Middlesex Deeds Register at London Met uses vendors names rather than purchasers, so I've not been able to find anything using those names I have. Given that this is the solicitor acting for the Widow means that the house may have been sold under his name rather than the owners - assuming that the deceased was in fact the owner.
if that is not the case I've reached a dead end and won't be able to prove any connection.