Yup, if the tree will still be there when you're done then no prob'... You will probably be just "allowing some more light in"
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Better than seeing some idiot cut it into 3' lengths.
I think the secret is not to get caught... the best way to be invisible is to wear a hi vis jacket and hard hat.
Of course, personally I've never cut Yew without permission
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(blimey it's hard to type with your fingers crossed
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)
Are you in the UK? If so, where abouts are you.
Del