Hugo, we did the low level version of your Llangollen walk earlier this year, and since then I have wanted to go up to Castell Dinas Bran, and after seeing your pics I will have to make the effort! We left the car in the free Forestry car park behind the Chain Bridge Hotel in Berwyn (just off the A5) and went over the pedestrian bridge to the Hotel and down to the canal. We then followed the canal towpath down to Llangollen and then continued down to the viaduct at Pontcysyllte, which was approximately 6 miles and beautiful scenery throughout, where we walked up to the main road at Trevor and caught a No.5 GHA bus to Llangollen (every 15 mins), and after a bite to eat caught the X94 GHA bus (every 2 hours) back up to the car at Berwyn. These pics show the views en route.