Please remember that we are at that time of the year when the birds are nesting so please be extremely careful when cutting your hedges that you are not disturbing the nests. (I have blackbirds nesting in my hedges at the moment) Please especially avoid using petrol operated hedge trimmers until after the nesting season.
The following link will take you to the wildlife and habitat management page of the gov.uk website which provides information on best practice:
https://www.gov.uk/topic/environmental-management/wildlife-habitat-conservation