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Can you lift the panels? Swapping a gravel board might be easier and apparently they are £35ish with a hole precast.
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Gravel board - rough wooden thing? Stitch drill holes of c.8mm or something (whatever is necessary for a hacksaw blade) diameter around the diameter of your desired hole, then hacksaw blade them together to knock out the centre? Sandpaper the result to a hedgehog-acceptable finish
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If gravel boards are anything like the posts they hang out with I think stitch drilling wont harm them.
My method would be to neatly stitch drill a round shape (so there aren't any right angles/corners to crack) using a fairly small bit - maybe 5mm. Then after go round with an >8mm bit which should hopefully join most of the holes to an effective cut. Then find something like a block of wood about the size of the hole, line it up with the bit being removed and give it one swift proper whack.
It'll be quite a lot of effort, so I'd question if the hedgehogs are really worth it. Do you know for sure it's an access route?
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Concrete gravel boards don't have any reinforcing steels in the thin sections between the 'frame'. Drill, rather than hammer drill holes to limit the cracking.
Drill the 5mm holes in the shape you wish to remove, then as above move up to 8mm, 10mm as necessary. The thin concrete should just fall out.
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@tbc
I want to make a hedgehog hole in a gravel board.
It needs to be approximately 13cm in diameter.
I have an SDS drill, but no angle grinder.
What's the cheapest way to do this? It doesn't need to be neat because a hedge will hide it, but I don't want to smash the gravel board to pieces.
Is there a way that doesn't involve buying a 110mm hole saw attachment?