There's a hole in my hedge

I have trimmed my front hedge in a new home for the first time today and there seems to be sycamore growing through part of it.
My first thought is that this isn't ideal and so i chopped away some branches but have been left with big holes.
I haven't chopped out all out yet, would you leave it, or chop it out. Will the remaining shrub grow to fill the gap perhaps, or i could plant something to fill?
Any ideas? 🌿
Thanks

My first thought is that this isn't ideal and so i chopped away some branches but have been left with big holes.
I haven't chopped out all out yet, would you leave it, or chop it out. Will the remaining shrub grow to fill the gap perhaps, or i could plant something to fill?
Any ideas? 🌿
Thanks


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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.