There's probably a popular book to be written about the conjunction of the RRA, the 24 Hour Fellowship and the Various CTT 24's over the years. John Taylor did a very comprehensive history in 2009, which any serious student of the subject has.
https://www.amazon.co.uk/Hour-Story-1882-2008-Including-Descriptions/dp/0956202314John's the father of Lynne, the holder of the record Jasmijm is challenging.
The RRA had two heydays, the initial period, when 'Gentlemen' dominated cycling records, and the commercial period, when manufacturers needed advertising. Road Records were the only arena for professional cyclists in the UK, and the big makers retained teams to go out and get records.
The public were knowledgable, and you couldn't go out and make up your own record. It had to be an existing one, in order to be broken. The RRA became the keeper of the records that mattered to the Public and the Press.
Later, the fastest riders in 12 and 24 Hour Time Trials got the LEJOG, and other records. They are still the Gold standard.
Since the arrival of the internet, other forms of long distance cycling have gained in profile. The 24 Hour and RRA cognoscenti like to be able to calibrate the performance of riders across disciplines. The best way of doing that is for riders to do the 24, or maybe even LEJOG. A big regret is that Mike Hall never did the 24. Ultan Coyle is one who crossed the disciplines, and could be said to be a throwback to the Raleigh professionals. Jasmijn is doing a grand job in extending the tradition of women in these rides.
What I'd like to see is Anco de Jong at the Mersey Roads, and Andy Wilkinson do a long Audax. Andy rides tri-bars, so LEL is the likeliest.
One thing to bear in mind is that if it becomes apparent that the record won't be broken, the observers pull out. The aspirant can then go on, in order to get a time, but the RRA is not interested in that. So you don't start an attempt if the weather isn't right.