Can skimmias get part wilted as such? Just been clearing some leaves and I noticed a third of one of the skimmias looked a little wilted...I have just watered them which I don’t usually do to see if that helps it along. Any advice would be welcome thankyou. 
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Not sure my photos show it too clearly...there is a definite patch of one plant that dosent look as healthy.
I don't know skimmias but if one part of a plant looks sick I'd look to see if it's broken or if the bark is damage
In the sticks near Peterborough
I can't really see the part that is looking particularly unhealthy. But, the general look of the shrub looks like many Skimmias about, tired and pale looking. Make sure they are mulched with new layer every year because they can be quite fussy, but are unlikely to die. I don't think it is a watering issue. In fact, Skimmias really do better in neutral to acidic soil so watering from the tap is not ideal. If you are collecting rain-water from a butt, then only use that if you need to water them. They turn a bit yellow too if exposed to full sun for too long, so check the sun exposure too.
I cant really help being a noobie but I can say that although I think yours look ok they don't seem to be anywhere near as advanceed as mine which are in full bloom (well as full bloom as Skimmia ever gets) I'm in Cheshire and have very sandy soil.
Dave
I don't see too much wrong either, although there looks to be a bit of physical damage in the first pic. They often get a bit of vine weevil bother, but a healthy plant will shrug that off, so it tends to be cosmetic. I'd agree with nut - if it's one obvious part of the plant that looks duff, check for signs of broken stems etc.
They can certainly look a bit rubbish in some locations at this time of year. I'd also agree with Borderline - they perform best in shade, and neutral to acidic soil with plenty of moisture, although tap water in the south could be an issue. It's why they do well up here - plenty of the right stuff falling out the sky
We have a nice one at work which is looking really good - just showing a bit of white in the buds now. It's been there a long time, and always looks pretty healthy. Right plant, right place.
I live in west central Scotland - not where that photo is...
They always look rubbish around here, (dry and alkaline) but people still grow them, they don't seem to mind as long as they get red berries
In the sticks near Peterborough
Thanks everyone. I only use rain water. I have other skimmias in pots that are thriving (common variety) that look fab with their tight buds. I love how they look from now until march and always think it’s a shame when the flowers open. I’m probably worrying about nothing but will check for damage on stems tomorrow X