Posted: 28/07/2013 at 23:20
You may find that cutting them back to 8 ft will look very ugly.
It may be better to take some of the trees out completely. But do not be bullied into doing anything you might regret. If he has asked you to cut back the trees it is hardly your fault if the birds no longer use the nest boxes.
Some of the trees are berry-bearing and provide food for birds. I would take out the excess hazels first.