You can officially complain to the Council about a high hedge on a neighbouring property in this section of the website.
You can download a form and guidance notes on making a complaint about the hedge.
However, making a formal complaint should always be a last resort and you are advised to try mediation first. For more information please see the Mediation Surrey CIO or email firstname.lastname@example.org. You can also call 03301 340 260.
The guidance notes - downloadable below - will help you to ascertain if you have a legitimate complaint.
The Council and other local authorities gained powers to deal with disputes over high hedges on 1 June 2005, when Part 8 of the Anti-social Behaviour Act 2003 came into force.
There is a wealth of information including frequently asked questions and more on the Office of the Deputy Prime Minister's website, in the section about about hedges and trees: