Thanks for the pointer on that app – works a treat although I did have to side-load it onto the aura. I downloaded/purchased it on my phone (easier to type in the password) thinking it would appear as a purchase on Play Store on the Aura.
It did not, wanted me to purchase again and when I tried that it told me I already owned it !!!!!
Anyway, got my file manager (Solid Explorer) mapped to the “Kids” button and a media player mapped to the “Top Picks” button.
The only thing it does not do is enable a one button press to BBC iPlayer which was one of the things I wanted to be able to do – but as a link for that appears on nearly every flavour of menu screen on the Aura it’s not really a problem.