Beags
I suspect you will find the 'legal duty' covered off in these 2 lengthy documents...RFA80 and RFA96...
http://www.legislation.gov.uk/ukpga/...9800009_en.pdf
http://www.legislation.gov.uk/ukpga/...9960014_en.pdf
...and that's not Royal Fleet Auxiliary!
PS. In answer to:
And precisely HOW are people expected to inform their 'Service Personnel Centre'?
it's on page 4 of the link in my previous post - at the bottom of the page is the address of all 3 Services' Reserve Cells. And you are correct, it moved to HQAir from Innsworth as did most of the other PTC functions during the STC/PTC merger. Is that really too unreasonable to ask people to track it down?
You could even Google "RAF Reserves" and it will lead you to the Reserves Cell at HQAir; unless, of course, you are a product of Bliar's British Education System and need to be "led to water" at every possible opportunity under the "Nanny State"?