I was wondering if anybody can recommend where to go for researching Officers in London Metropolitan Police.    My grandfather Patrick James Mangan joined in July of 1910, his number was 98743 and he was in S Division  - his collar number S-585. He was dismissed as a striker on 1 August 1919, serving in F Division at the time with collar no F-82.   He lived in Kenley Street, Notting Dale I would love to find out what kind of events he policed or cases he was involved.  I have the