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"
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
(blimey it's hard to type with your fingers crossed
)
Are you in the UK? If so, where abouts are you.
Del