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Yellow veins
does anyone know what this mean in my previously healthy laurels? Losing becoming paler green and veins turning yellow

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Unless there's some other problem with the way it's growing - ie poor soil, browning/dying foliage or too dry etc, then it's unlikely to be anything to worry about.
Impossible to offer more advice without seeing a wider view too, and having more info.
I live in west central Scotland - not where that photo is...
It's always better in that instance to add organic matter to the area [especially well rotted manure] and leave it all for a while to break down and improve the soil completely, or - if you're needing to plant right away- make the trench big enough that you can mix the soil you take out with lots of organic matter, and put it back in before planting.
It also depends on the size of the plants and when they were planted. Large ones [ie - over about three feet/90cm] will always struggle, and are better cut back on planting. Small ones are much easier to get going. Autumn/winter planting is also easier for them to establish as it's cooler and wetter, and less stressful for the plants as it's easier for the top growth to be sustained.
I live in west central Scotland - not where that photo is...