QuoteWhen you can trim hedges or trees
You can trim branches or roots that cross into your property from a neighbour's property or a public road.

You can only trim up to the property boundary. If you do more than this, your neighbour could take you to court for damaging their property.

If you live in a conservation area, or the trees in the hedge are protected by a 'tree preservation order', you might need your council's permission to trim them.