Hi sunflower,
The 50p was a good idea, to get a estimate on the size.
To me it looks more like a worm cast.
The Hedgehog poo's I've seen are usually black and streaky, but I could be wrong.
I saw a typical hedgehog dropping on my lawn this morning that reminded me to post another reply.
It was approx 4" (10cm) long, about the thickness of a pencil, black and shiney and usually tapered to a point at one end, sometimes 2 or 3 in a line.