Forest Hill 'panther' ?

"I saw a cat like creature in Forest Hill. I was in the Millennium Albion Woods and it ran past us, we disturbed it. I was freaked out as I was with my kids. It was not a deer, muntjac are supposed to inhabit this green area. I know what deer look like, this was a black feline animal, very swift, it was large too, so not a domestic cat.  It all happened so quickly and totally unexpected so it was difficult to make much out. What really caught my eye was its black colour, it moved very quickly like a cat, I would've expected small muntjac in there I have seen them elsewhere and this was not a deer. It was too fluid and powerful. It's size I would say was appx three foot from head to back legs. I can't say for sure I saw it's tail I'm afraid. It happened in an instant my kids didn't see it at all. It was bigger than a domestic cat, much bigger, obviously very shy. It reminded me of TV programmes I've watched about pumas or lynx. I thought, "I saw a deer it can't have been a big cat" but my eyes told me it was a cat. I'm convinced. I had never known of their existence until I got home and did a bit of research which is where I came across your stuff. It happened at about 11.30am on Tuesday 28th October, 2014. In the Albion Millennium Gardens in Forest Hill off Albion Villas Way".