Alright mate, if you can find out if that tree had a TPO on it, the person who cut it down could be liable for a £20000 fine and the cost of a replacement tree, or £5000 for damage to it....ie pruning, but you'll have to be able to prove who hacked it first!!!! if what they've left is a stump it'll grow back like a pollard and then you'll have to have it sorted every 5 years or so, also by just leaving the main stem like that, the tree will be open to infection and disease and might mean that the tree will lose alot of its core strength in the future if it recovers!!!!!! Also seeing as pops