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Postings for the King's Guard are usually formed from one of the five regiments of foot guards:
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Grenadier Guards
Coldstream Guards
Scots Guards
Irish Guards
Welsh Guards
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The Scots Guards (SG) is one of the five Foot Guards regiments of the British Army. Its origins are as the personal bodyguard of King Charles I of England and Scotland. Its lineage can be traced back to 1642 in the Kingdom of Scotland, although it was only placed on the English Establishment in 1686

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A sentry will be on duty "at their post" for two hours. Every 10 minutes, he comes to attention, slopes arms and does a march of 15 paces across the area of the post. Each sentry does this four to five times before halting. He then shoulders arms and stands at ease. 'Standing easy' is not permitted whilst a sentry is at their post. Orders for sentry duty read out before each two-hour 'tour of duty', make it clear that sentries "may not eat, sleep, smoke, stand easy, sit or lie down during [​their] tour of duty"

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Sentries receive instruction on how to eliminate nuisance or any suggestion of threat from members of the public. There is a protocol they follow which begins with "stamping" (coming to attention sharply). He will also shout: "Stand back from the King's Guard" or similar. If this does not eliminate the nuisance or threat he will repeat the stamp and shout again. If the nuisance or threat still does not cease the sentry will assume the position of "port arms" whereby he points his rifle at the source of the interference. If these warnings are not heeded the sentry then has the choice of detaining the person(s) himself or pressing the button in his sentry box to summon assistance.

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if a person steps in front of a sentry while he/she is marching, the latter will shout: "Make way for the King's Guard!