So I had better tell this story now.
It was November a few years back. I was out for a run, the weather was foul and I have a route that I know like the back of my had and has some shelter along the way. It was late in the evening and I was 'chasing the light' as I topped out on a Tor I stopped to look down on flat area below me and I thought WTH is my dog doing there - this long black shape with a long tail (my Rottweiler has a full tail) - I noticed that her pink collar was missing as well. I whistled to her and was taken back when I realised that she was actually sat beside me. I was 2km in any direction from the nearest car park, in the middle of nowhere on the cusp of darkness in bad weather, there was nobody else up there.
I realised what I had seen, or thought I had seen and (stupidly) ran after it and after my dogs; I was worried the they may be hurt. Then.... nothing, vanished, gone.
I ran down through a forestry track and after a mile or so eventually came across a farmer on a quad with his collies. I asked if he had been where I had and the answer was no - I told him what I had seen and he shrugged it off...
I contacted the big cat society and had a few exchanges from them - there had been previous sightings where I was - They believed it was a Jaguar.
As time has gone by, I disbelieve my own story bit by bit