The above information is a little out of date as follows:
1. It is worth pointing out that the LPA cannot enforce the replacement of tree which where felled under exception if they were dead or that they impose an immediate risk of serious harm if the trees were protected by a woodland designation. Only individuals or groups can be enforced in this way. The LPA will try though but refer to regulation 14 of the 2012 TPO regulations for further information.
2. The dead, dying or dangerous exemption disappeared with the 2012 regulations. They are now called exceptions and the above has been replaced with dead trees, dead branches within trees, or trees which impose an immediate risk of serious harm. 5 day written notice is required for dead trees and the immediate risk situations. If there is no time such as a hanging branch over the highway at the weekend. You could remove the branch and submit the notice retrospectively but this should be as a last resort. You will need to prove the situation to the council so detailed photos would be a must or you could be prosecuted.
3. The introduction of the Legal Aid, Sentencing
and Punishment of Offenders Act 2012 (Fines on summary conviction) Regulations
2015, means that fines on summary conviction are no longer limited to £20,000 for wilful destruction.
Fines for the wilful destruction of a TPO tree issued by the Magistrates Court are now
unlimited. Fines have always been unlimited when issued by the high court but the change in legislation as of March 2015 means that now even the magistrate can issue fines for much higher amounts. Fines of more than £100,000 are not unheard of.
4. The above TPO guidance material was withdrawn in 2012 as it reflects the old regulations. The new guidance can now be viewed at: http://planningguidance.communities.gov.uk/blog/guidance/tree-preservation-orders/
Hope this helps