I have USB plugs with the output on the same side as the Live prong:
This means more than one plugged in next to each other in a multigang will often "bump" USB cables.
Can I buy a multigang with the sockets rotated 90°? Kinda like my diagram:
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This is but one example of my understanding of your objective:
It has the added benefit of providing a pair (or more) of USB outlets. I do not suggest this is the single best answer, as my search returned far more results than is possible to post here.
Using The Google with the terms "power strip rotating sockets UK" may be the best way for you to find the item to best fit your budget and requirements.