Let's not overlook a collection technically, if not logistically, on your own doorstep: Amazon World.
On my recent visit, I saw:
Three-banded Armadillo
Six-banded Armadillo
Lesser Hairy Armadillo
Greater Hairy Armadillo
Hoffman's Sloth
Giant Anteater
Tamandua
I only know of the Greater Hairy Armadillo breeding, but that's not to say other species haven't.
That's not taking anything away from Dortmund's Anteater House though which is one of my favourite zoo places.
Whilst the Isle Of Wight is great for a general holiday with enough to keep a zoo nerd ticking over I'd be tempted to go to Dortmund instead which is a great general zoo (with a good small cat collection and a number of other great obscure species too). From Ayr I can't imagine the total travel time and costs would be massively different.
You've also got a lot of other top grade zoos near Dortmund too but that's a bit off-thread.