Other trails - when can I ride them?

If I'm in a forest in England and I see a track going from the marked blue,red,green,black route into the trees that has obviously been used by others. Am I allowed to use it or is it against the forestry commission rules?
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'hey this is a footpath'
"really, dammit I must be lost, I am supposed to be on this, can you help?"
works every time =-)
For the haters out there:
1: I am not going to read your responses
2: I only ride on terrain that will not be damaged, in the dry and yield to all other users.
In some cases the FC turn a blind eye as there's not a lot they can do, except erect No Cycling signs everywhere.
What you also have to remember is that a lot of FC land is open access, but this is to walkers only. Cyclists don't have open access rights which I think is a shame.
This only applies in England and Wales, Scotland has different open access rights in where cyclists are allowed to enjoy the same paths and trails that everyone else has access to, unless otherwise signposted.
That's the legal standpoint, whether I think you should ride them, that's up to you to decide.