Hi mate,im a tree surgeon,it depends on what branch(no pun) of tree surgery you want to get into.If you want to work for the utilty side of things,eg clearing power lines,railways,waterways etc the training is fairly basic,you do a week long chainsaw course involving felling,saw maintenence etc at a cost of around £500,this will qualify you for a groundsman/chainsaw op,then you can do the climbing/ariel rescue course which is also a week long and around £500,plus using a chainsaw from a rope and harness,this will qualify you as a climber.Then you will need to do a course for the utility comp