British Military - What do I Already Know?

= How do I find my Ancestor in the British Armed Forces? =

What do I want to know?

 * Which branch?
 * Was my ancestor an officer or a soldier?
 * What regiment did he serve in?
 * Can I find life events or family relationships in military records?
 * Did he receive a pension?

What I already know:

 * Which branch of the armed forces
 * British Army
 * Royal Navy
 * Royal Air Personnel
 * Royal Marines
 * My ancestor's name
 * The time period
 * The regiment