There has been some woodland management in the Colden Valley by ring-barking a small number of Sycamore trees. The first photo show one that has also been topped and then a coronet cut made on the end of the remaining trunk.
This technique was originally developed for branch reduction on ancient trees to try and mimic a natural break, the theory being the tree responds with new growth better than when cut cleanly across. Not sure what the purpose of this coronet cut is in the Colden situation.

The second photo shows one of the most interesting Sycamores in Colden; I do hope they leave this one alone. Characters need preserving.