In England, you usually need council consent before touching a tree with a Tree Preservation Order — check before you cut.
Carrying out work on a TPO tree without consent is a criminal offence under the Town and Country Planning Act 1990.
Even exempt works often require advance written notice to the council under the TPO regulations.
Conservation area trees without a TPO legally require prior written notice to the council before work, even though no TPO exists.
Unauthorised work on a protected tree is a criminal offence under the Town and Country Planning Act 1990 and can lead to prosecution.