Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first.
What assets did he have the best of knowledge
Was the house owned in joint names?
If it was then it passed to his partner automatically with no need of a Will - as did all accounts held in joint names.
It is also likely that she was nominated to receive his pension
You can check the house position using the Land Registry portal here
If you wish to take it further then you will have to write a polite letter and ask about his estate.
I hope that this is of assistance - please ask if you need further details