Grizedale Forest - finding some challenging trails

Back in the Lake District for the first time in ages and I thought I'd head to Grizedale Forest to explore, looking for tracks that aren't exactly official... Grizedale Forest, whilst lacking in elevation compared to much of the Lake District, is a huge area and is littered with fantastic trails that cater for all abilities and types of riders. There's fireroads, fantastic bridleways and if you are easily pleased, the North Face Trail. There's also other stuff. Scary stuff.