Luckily the UK is already covered well for online registry information.
For the UK there's the G-INFO site that you might already know about,
https://siteapps.caa.co.uk/g-info/ although the types are not always recorded in exactly the same way, sometimes a search might not find all examples.
For example since you have done some Pilatus PC-12 paints, this is the list pulled up by G-INFO for the mainland UK.
1 G-ERGP 1564 PILATUS PC-12/47E
2 G-FITC 1926 PILATUS PC-12/47E
3 G-FLXI 1275 PILATUS PC-12/47E
4 G-GEFF 1359 PILATUS PC-12/47E
5 G-KARE 1257 PILATUS PC-12/47E
6 G-KFTI 1813 PILATUS PC-12/47E
7 G-LBHA 1904 PILATUS PC-12/47E
8 G-LUSO 1880 PILATUS PC-12/47E
9 G-MAKN 1744 PILATUS PC-12/47E
10 G-NBCA 1717 PILATUS PC-12/47E
11 G-OMSL 1842 PILATUS PC-12/47E
12 G-PCIZ 1639 PILATUS PC-12/47E
13 G-PCTW 1674 PILATUS PC-12/47E
14 G-PKHA 1776 PILATUS PC-12/47E
15 G-TRAT 710 PILATUS PC-12/47
This is the whole Guernsey register for May, but it is about to be updated - it looks as though it is done monthly.
https://www.2-reg.com/wp-content/uploads/2020/05/register-20200501-2.pdf2-DARE
2-FLYT
2-FLYY
2-LIVE
And there are 34 PC-12s on the Manx register, searchable here
https://www.iomaircraftregistry.com/about-us/registered-aircraft/I'm not suggesting PC-12s as such, but you've made a lot of PC-12 paints recently and I was just curious as to how many come up in a search, 53, unless any new 2- reg planes were registsred in the past month. That's probably too much for a month especially if you want variety, but at least the search locations are here if you need them!