Reduce size of Magnolia tree in rear garden

Job description

I have a fairly large Magnolia tree in my rear garden, which seems to be growing rapidly since I moved in less than a year ago. I would like its size reduced as it blocks out light to my property and in my opinion is too close to my extension.
My children also play in the garden a lot of the time and I'd like the tree to be safe and more manageable for me to deal with in future.

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