Three Range Rover P38's driving the length of Sarn Helen near Neath in South Wales. I manage to get myself stuck in some deep water at the start. Its probably one of the most famous Byways in the UK and is only open in the summer months (please do your own research). I can recommend this lane for most levels of experience as its good firm going all the way along and not much to challenge most 4x4's or trail bikes. The views are what make it all worthwhile, although when in the forest section you cant see a great deal.