[Station X]

In the days of Post Office Telephones the country was divided into Telephone Areas such as "Norwich Telephone Area", "Cambridge Telephone Area etc. Each Telephone area was run by a civil servant called a "Telephone Manager".

The E /Radio (Engineering Radio) department was responsible for investigating radio interfence, so when your notification arrived at the "Telephone Manager's Office" (TMO) the post room would forward it to that department.