Special Patrol Group (SPG) in Northern Ireland and also London Metropolitan Police.

Journals

Constabulary Gazette, Oct 1973
Constabulary Gazette, Aug 1973
Constabulary Gazette, Apr 1973
Constabulary Gazette, Mar 1973
Constabulary Gazette, Oct 1972
Constabulary Gazette, Sep 1972
Constabulary Gazette, Mar 1972
Constabulary Gazette, Apr 1971