'I live in Brockley in SE4, London. Our garden backs onto undergrowth and the train line South East.
On Thursday night (24th March) my partner noticed a large black shape at the end of our garden making a strange growl as my domestic cat Peach was freaking out looking at it from the window. He went outside only for the creature to have gone rather quickly.
I returned home later on and opened the back door to the garden (It was the first nice evening we'd had) and I obviously startled the creature again and it ran away, clearing three or so garden fences in a matter of seconds. Very heavy footed, claws audible and the strength of the thing evident. We startle foxes and other cats all the time and none of them moved in the way this one did. It was remarkably quick and powerful.'