I guess that you have Shot Hole disease. They start with those red blotches and then they fall out leaving a hole. Many Photinia suffer from this disease. You can leave it or spray with Fungus Fighter which will deal with it in the short term but it often returns. I would leave it and perhaps just give it a good feed in the spring and leave it.

Thanks Jimmy, I’ve looked this shot hole disease up - looks like you’re right with the diagnosis. I’ll take your advice.

I think its Photinia leaf spot, rather than shothole disease - its a physiological disorder common in Photinia in this country. They don't like damp cold weather much, so this often happens and it will recover in spring when new growth begins. Further info in the link below, scroll down and select Problems...

https://www.rhs.org.uk/plants/popular/photinia/growing-guide

Both mine have this,Kate,and although unsightly,I shall just leave them alone,and just pick up and dispose of the fallen leaves. They just have to take their chances.

Thanks Bloomer and Bamboo. I’ll have a look the site/link you mentioned.

I can’t grow them here...they just die.

That’s a pity, saying that, your garden looks fantastic without having them in it!

Thanks Kate! I'm not too bothered to be honest. They aren't a favourite of mine. Although when I see them in southern gardens they are stunning...and they flower too! Gorgeous in the right environment. Not great in Eastern Scotland.