Looking at the link that it could be Nephus bipunctatus. The size looks right and it was black and the red markings were at the back of the elytra, I can picture it in my mind it seems pretty good to me. I wouldn't have said it was hairy though, but the hair just might not of been visible to the human eye, in a woodland with people crowding round it was quite dark.
Thanks for all your thinking!

I am busy this morning but I am so tempted to go back this afternoon if I have time, and see if it is still there or at least on the same tree - two day's on it's unlikely I know

, but then I know I have done my best.