Ours in Lanarkshire represents the Crown at civic functions and ceremonies etc. They get a proper colonial type functionary cocked hat with plume as well as this one. no Idea how they are appointed though.
It is an ancient and honorary position bestowed upon the oldest man in the county, whose duty it is to fall over in the presence of visiting royalty or other dignitaries.
This demonstrates, by drill movement, the awe in which the visitor is held and obviates the need for guardsmen being present to fulfil the same function.
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I had a visit from Field Marshall Lord Bramall a few years ago when he was Lord Lieutenant of London. I'm sure he'd appreciate being thought of as TA. Nice chap though.
To be frank it's a pain in the a##e with no gain unless you have a chap that does take notice of you.
If a senior serving cadet apply for the cadet exchange programme with Canada. Much better experience. That does look better on any application,trust me.