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hoefla-
Hilti DD3350 as used in Hatton Garden? Or an angle grinder?
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Angle grinder will do it, you'll need a diamond disc for the concrete and a metal cutting disc when you hit the reinforcing bars.
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What's the height of the concrete gravel board?
If you are aiming for the 130mm indicated above,
if it is 150mm/6 inch you won't have any strength in the remaining
thin edges as you will have cut through the (derisory) reinforcing steels.If it is 300mm/12 inch you could drill a series of holes through the thinner mid-section and knock out the sized hole you want.
jellybaby
ColinTheBald
mespilus
For hedgehogs a 13cm X 13cm hole cut in the fence base. More holes is better. I expect toads would also appreciate the holes.
More info at https://www.hedgehogstreet.org/help-hedgehogs/link-your-garden/ including some links to suppliers of precast concrete gravel boards with holes.