That appears to be vine weevil damage - if your plant is contained in something, that makes it more likely to be vine weevil. A soil drench at the right time is useful - there are two different nematode types to use, but one is more temperature dependent than the other. In theory, its a little late to use the hardier one, but I'd give it a go anyway if the supplier you find can get it to you very quickly - recommended time for treatment with Sternernema is early September, but its actually warmer now than it was then. Further information in the link below, you'll need to copy and paste it into your browser

https://www.rhs.org.uk/advice/profile?PID=234

Looks like vine weevil to me. Provado Vine Weevil Killer says that it can only be used on containers and baskets. The grubs feed on the roots and emerge into flightless weevils that feed on the foliage. It looks like your Photinias are in a container to that should do the trick.

Thanks for your advice, and information on Vine Weevil. I have 5 Photinias bushes planted in a 9ft x 1ft brick build planter. All the bushes seem to be infected/eaten.

Would the brick built planter be classed as a container (a large one obviously) lol

In short, yes, in that vine weevil prefers enclosed spaces, even of it is large.

Thanks for your help, I've now been busy researching...

Should I buy and use the a biological Nemasys Vine Weevil Killer it says thus can be used up until November or a chemical compost drench like Bug Clear Ultra Vine Weevil killer?

Can both be used, or would the Bug Clear kill the Nemasys?

Thanks

Don't use the two together, the Bug Clear may kill the nematodes. From an environmental point of view, I'd recommend the Nemasys every time - Provado Bug Clear is a last resort, because its neonicotinoid based and that kills bees as well as other insects. Use the Nemasys now (if you can get it quickly) and then again next year. I've used the Nemasys one and it worked well, only needed one treatment but admittedly, I used it in early September.

Thanks for all your advice and time bamboo, it's been much appreciated. I will order the Nemasys this morning.