Try with the phone photo ... they usually work ... we need to see the plants and where they are ... we also need to know how you've been caring for them since they were planted.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
If you want them to bush out and form a hedge you need to reduce the height by half in order to encourage lots of sideshoots.
But how can we tell you what's wrong with the unhappy ones without seeing them ? However, if they're that close to large trees they'll definitely be suffering from a water shortage.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Your shrubs are too mature and with the heat followed by a dry spell and then a heat wave. I think the only way to solve this issue right now is to prune them down by half of its original size. Lay a very thick layer of mulch down and still continue with your watering, which is basically a lot of water deep into the root area in the late evening time at least every other day unless temperatures drop below 21 degrees, then you can slow down on the watering.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
But how can we tell you what's wrong with the unhappy ones without seeing them ?
However, if they're that close to large trees they'll definitely be suffering from a water shortage.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.