Yew hedge issue!

I have a yew hedge that has been planted approx 18 mths but the two end ones (opposite)look slightly brown. As seen above. They are protected from the wind. Can anyone suggest reasons for this discolouration compared to the others or how to improve the situation please.
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If you live in Derbyshire, as I do.
If you live in Derbyshire, as I do.
If you live in Derbyshire, as I do.
Might be patio foundations mean they get less moisture. With the hot summer we had, but saying that the others ought to have been affected, unless the conditions either end warrant it.
Also opposite, conditions if they got too wet, yew does not like very soggy feet, I think it affects them more when young.
Looks like someone has used a pressure washer?
Any chemicals used or maybe somehow water excess or damage?
Though I imagine that would affect the others too.
Sometimes odd ones do die off. I saw three in a long run of hedge newly planted that died off for unexplained reason. It was a public garden and we were curious and asked a gardener there that is what they said rather than anything like rocks or debris, it had been a well prepared bed.
Have a little snip at an end or two and see if they look alive, or scrape a little bark lower down see if they look alive.
Good thing with Yew is they will regenerate green again if it is just a surface damage.
Anyway , nice choice my favourite kind of hedge plant and tree.