We had an over hanging oak tree that was rotten to the core, hollow in fact, it was over hanging both my garage and the neighbours conservatory, Gareth and Jack climbeed the tree to assess the options, a "sectional dismantle" was called for and the tree was removed safely without any damage being done ( which I thought was a miracle, but they were well insured) and they chopped everything into logs for my wood burner and cleared everything else away...couldnt ask for a more professional job