Dangerous overgrown council trees over property

The trees are from hembrigg Park morley they are excessively high which are at the back of mine and neighbouring properties they are becoming seriously scary and dangerous in winds, branches keep snapping off into our gardens were children play, there over growing garages and outbuildings, ours gardens are covered daily in bird feaces were we have outdoor eating as the trees are over our land were the birds sit. We reported them a year ago and haven't had any follow ups. We've lived here 22 years and they've never been maintained at the back of our properties and there approx 100 foot high. Please can they be lowered but not removed. Thank you.