Thanks guy's for all the info

I'll ask one of the horticultur guys here an confirm what it is, there are hundreds of self seeded hawthorn and Irish strawberry trees all over where I work an they are so similar in Colour an leaf shape, unless it's flowering or fruiting I get confused
I have another hawthorn that I cut back that i know 1000% is a hawthorn it had the white flowers on it an it has started with spots but not as bad i will post a photo tonight
Should I remove all the foliage with the spots now?
“The beginning is perhaps more difficult than anything else, but keep heart, it will turn out all right.”
― Vincent van Gogh