Using a UK format Mac keyboard layout

I've installed Zorin 16.1 Pro on my ThinkPad, and everything works perfectly (thanks guys!). One minor issue is that I use an external keyboard which is UK Macintosh format, and there is, as far as I can see, no option to select that format in the keyboard settings.

Control/Option/Command all work fine, but the UK layout has the @ symbol as shift-2 and the " where the @ is on US layouts, plus (of course) £ as shift-2 and the hash key as option-2.

When I've used Ubuntu in the past it has had UK Macintosh as one of the options, but the only Mac keyboard options I can find on Zorin are for other languages. Can someone point me in the right direction? Thanks!

Found it! Now I feel like a putz.