more on my doorstep than you can imagine
Phil is definitely the boy to speak to...
It would def be worth calling the council, I know that some of Sarn Helen is closed off to cars now, especially over by Dolwyddelan. Anything over this way is worth a double check, also, some must be forestry involved somewhere along the route, and I would suggest avoiding the Penmachno bike trail like the plague, as its a pita to go up there. They complain when they nearly run into you

(cue comments about cleaning mud of mountain bikers

)
The one that you have listed as going over Penmachno - Ysbyty Ifan is one I am sure I have done with Phil, and someone else did this last year, as I stole a picture they took. It is a really nice lane if I am thinking of the same one.
I am (finally) getting Stan (my old b series) back in a couple of weeks, so would be well up for a reccy if i can get my lift and wotnot sorted out quick enough
