Our three guests have each witnessed big cats north of London in and around Hertfordshire and Essex – Matt encountered a black leopard on land where he is a deerstalker, while Andrew was awoken from his hammock in the night by his dog sensing a big cat, and Simon viewed a black panther when walking his dogs in Epping Forest. And Simon’s wife was a sceptic until they chanced upon something important when travelling in Scotland…Words of the week:   wicked problem 19 June 2021