Every year grey herons gather in large numbers to breed and raise young, building huge untidy nests out of large twigs, perilously perched high up in clumps of tall trees. London’s Battersea park has a heronry of 30 nests, but from Ulster to Northamptonshire and Devon to Cheshire, now is the best time to see these nests in the wild. Here is a list of best places to see heronries 
