I'm just looking for a PSU for the controller, and of course, 5-12V with a 2.1mm connector is about the only one I don't have knocking about. Am I correct in assuming that something like these would be suitable?
I shall be rooting around in my box of supplies to find something suitable too!
Something a little lower than 12V may be kinder on the regulator in terms of power dissipation for example.
But that Maplin one looks fine at first blush.
Plenty of 6V ones on there too, maybe one of those would be better.
Looking at the LD1086DT33TR as specified:
then its drop-out voltage is low enough that a 5V supply may in fact be fine, eg a meaty USB.