I'm as certain as i can possibly be that i saw a big black cat a few years ago in somerset, beside the M5 of all places. I was travelling up to uni in mcr and i saw a large black animal to my left. i looked and i could hardly belive it, still dont hardly! It was in the field closest to the M5, on the far side of it tho, just strolling along. The 's'- shape of the tail is what convinced me, but both my girlfriend and brother (who were sat either side of me in the front of my van) both saw it fleetingly. one swore it was a dog, the other a cat.
It was approx 11 in the morning, early sept 1999 (i think)
to this day i'm still not sure, but if i had to bet my life on it i'd say it was a big cat.
love the thought that they maybe out there. I heard that Nick Baker was going to make a tv show for ch5 looking for them over the summer, did anyone see it?