Nico
I was just reading this about Pype Hayes Hall which explains the connection I was looking for.
"The late owner of the house was Sir Walter Bagot who was elected as an M.P and whose grandson was to become the first Lord Bagot. The family were also to embrace clerical connections when the Rev Walter Bagot became the house owner. He was the intimate friend of the poet William Cowper, who had written extensively to the clergyman, Robert Southsay, the writer, and came to stay at the house in order to study and record Cowpers Letters when he was writing a Biography of the celebrated English poet. The Bagots stayed at The Hall until 1908 when it was sold to James Rollason a local manufacturer who lived there until 1919. In that year it was sold to Birmingham Corporation who converted it into a Convalescent Home, and the grounds into a Public Park. Until the late 1980's Pype Hayes Hall held the distinction of being the oldest lived in house in Erdington".