Hiya Padge,
People often do the "Arranged" bit to songs.
It's quite naughty, as, Royalties are divided 4/12ths to the writer of the words , 4/12ths to writer of the music, and, 4/12ths to the arranger.
A bit antiquated but that's how the PRS distribute royalties.
I wonder if these people try to claim (say) if John got £6.00 a time it was on a radio programme , do they try try to claim £2.00 when and if their version is sang on a radio programme.
I believe, in the first place the "arranger" should have written permission from the author/composer/arranger to "tinker" with the Original.
It's a shame Booker won't make Saltburn-he owes me a pint .

Cheersy
Betsy .