RE MT Walton’s letter about High Force and Cauldron Snout (HAS, Feb 2). The highest waterfall, albeit underground, in England is that of Fell Beck after it enters the pothole Gaping Gill on the southern slopes of Ingleborough Hill, North Yorkshire.

Anyone visiting it, which entails a fair walk from the village of Clapham, would be well advised to keep clear of its edge. It has a single drop of 365ft.

Dave Cook, Sacriston, Co Durham.