The Bank Holiday weekend is expected to draw crowds of walkers to Yr Wyddfa (Snowdon), many of whom will queue patiently for their turn to take a summit photo. Most will pause for a drink, a bite to eat and some well-deserved rest.

Whether intentionally or not, some will contribute to the litter problem that has marred the mountain in recent years. The British Mountaineering Council (BMC), one of several groups striving to keep the peak rubbish-free, suggests that many items are discarded unintentionally.

“In our experience, most people will try to pick up what they have dropped,” said a spokesperson. “But they can’t if their litter has blown out of reach and in an inaccessible location.”