Posted: 05/03/2015 at 16:19
Nic your picture hasn't come up but it's probably Photinia leaf spot, usually caused by stress to the plant. The causes are varied, cold winds, exposed siting a cold winter (which it been relatively)
I don't know if the ground it's planted in is heavy, but I'd add a good quantity of well rotted manure and feed it generously with growmore.
I'd prune out any dead stuff afterwards. They can recover quite well as the weather improves.
Just seen the picture, prune the dead out and feed as above. It's probably better off in the ground rather than in a pot.