Re Sarjeant Mayne 1791 England Etc Marscus 20 5 2011

You will excuse me for taking your query two ways as their appears their could be Three explanations even though you have given a precise date . > I classified them as ( a ) and ( b)and ( c )

(a ) Old Bailey Proceedings Online (www.oldbaileyonline.org, version 6.0, 20 May 2011), February 1791 (17910216).this is an exract of a law case involving a Serjeant Mayne . It is a law case which is to long to pout in a journal for this website and I think the Sewrjueant was only invovled in capturing him ? A short abstract from the old bailey Procedings ( refer to the beginning )

the 16th of FEBRUARY, 1791, and the following Days; ...... and he ran after him and took him at the Horse Guards; ... Serjeant Mayne gave the prisoner a very good character, and said he was a good soldier ..
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From Wikipedia - Marcus Sarjeant ( who took shots at the queen ).
Sarjeant, who was from Capel-le-Ferne, near Folkestone, Kent, went to Astor Secondary School in Dover. He was a member of the Scouts, becoming local patrol leader before leaving to join the Air Training Corps in 1978. In the ATC, Serjeant won a marksman's badge, and he owned an air rifle. After leaving school in May 1980 with seven CSE passes, Serjeant applied to join the Royal Marines but was unable to accept the discipline and left after three months, claiming that officers bullied him. He also tried to join the Army but stayed only for two days of an induction course.[2]

After failed applications to join the police and the fire service he worked at a zoo and at an arts centre in Folkestone. Under the Youth Training Scheme he worked at a youth centre in Hawkinge.[3] Friends reported that in October 1980 Sarjeant joined the Anti Royalist Movement. At the time of his attack on the Queen he was unemployed and living with his mother (his father was working abroad).[3]

He tried unsuccessfully to find ammunition for his father's ·455 revolver, and to get a gun licence of his own; he joined a local gun club. Through mail order he paid £66.90 for two Jackal Python starting pistols, which looked like Colt revolvers. In the run-up to the annual Trooping the Colour ceremony, Sarjeant sent letters to two magazines, one of which included a picture of him with his father's gun. He also sent a letter to Buckingham Palace which read "Your Majesty. Don't go to the Trooping the Colour ceremony because there is an assassin set up to kill you, waiting just outside the palace". The letter arrived on June 16.[2]

( c ) Their is also a Third version _ which I did not research on the web . I am being over cautious with your query on who you may be researching . Sounds not right somehow . Any way i have tried to assist you with your query

Till we meet again -Regards -edmondsallan