Leaf spot / black spot

Hi Adrian - As I didn't know the answer to this, I did a bit of research ... Looks like they're very similar if not the same and are fungal infections. Good old BBC have a useful page ...
http://www.gardenersworld.com/how-to/problem-solving/black-spot/
I'll be watching other answers - someone, somewhere on GoY, will know all the details!

Thank you.
You've gained some knowledge and me too.
Cheers.