I tried to find couple of lanes just beyond llangollen in froncysyllte. found one end of one which went into a field as map suggested, but couldn't see way out of the other side (it wasn't a particularly large field). I kind of got the impression that it was deliberately not marked/ obvious to put people off.
anyway, i turned back and went to try to find the other end of the lane, but again, not easy
just wondering if any local knowledge would help me out