As Pansyface says, you may lose a few flowers, but it looks a healthy plant and well cared for. If you're not too fussed about the flowers and want to keep it tidy then go ahead
Not sure who advised that you wouldn't get flowers on a spirea after cutting back @Treeface, however, the timing of those flowers may have been affected. The early ones I have, all get pruned back by taking out a few stems if they're getting too bold, but they flower the following year no problem because of when I do it. The summer ones are different, but again, it's just timing. All shrubs benefit from some rejuvenation though. With the climbing hydrangea, restricting the growth affects the flowers, which is a shame, but it certainly doesn't affect the plant at all, as already said @gfs44
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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If you're not too fussed about the flowers and want to keep it tidy then go ahead
With the climbing hydrangea, restricting the growth affects the flowers, which is a shame, but it certainly doesn't affect the plant at all, as already said @gfs44
I live in west central Scotland - not where that photo is...