Public Record Office OnLine Catalogue

National Maritime Museum, Greenwich

Commonwealth War Graves Commission

Imperial War Museum

19th Century British Wars & Campaigns

The National Roll of The Great War, 1914-18: Manchester   

Land Forces of Britain, the Empire and Commonwealth

Malta Family History - UK forces connections

Imperial Yeomanry  

British Light Infantry Site

Regiments.org

The Cheshire regiment

Public Records Office, Kew

WO97 Site (War Office Files)

The Asplin Military History Resources (incl. Boer War)

Military Badges &  Insignia

Military Badges

Ministry of Defense Military Medals & Records  

British military medal portal  

Hall of Medals

Ray Havens Medal Collection - 1845-1945   

Medals of the two Word Wars  

Abbreviations found on British Medals

Wartime Merchant Navy

The capture of the Enigma Codes

British Gallantry Awards at sea

British Military Records

Royal Lancashire Volunteers  

GENUKI - UK and Ireland Military History

Royal Marines

Royal British Legion

Royal Air Force Site

RAF Commands

Biplane Fighter Aces from the Second World War

RAF Association

RAF Museum  

Fleet Air Arm Archive 1938-1945  

World War I Trenches on the web

The Long Long Trail - 1914-1918 resources

The Great War - 1914-1918 - Photographs of personnel available   

British National Army Museum

Palace Barracks Memorial Gardens, Northern Ireland

World War II Memories Project   

Heywood Cenotaph   

South African Roll of Honour   

Gallantry Awards Mailing List Archive   

If you are unable to find the answer you are looking for from the above links, I suggest you subscribe to one of the specialised Mailing Lists to be found on http://www.rootsweb.com/~jfuller/gen_mail_wars.html and post your question there.