A donkey code of practice is being brought in to stop anyone over 50.8kg (8st) from riding the animals, amid growing fears that Britain’s 850 donkeys are buckling under the weight of heavier children and putting their health at risk.

As childhood obesity becomes an increasing problem, a whole generation could miss out on what has become something of a rite of passage at Britain’s seaside resorts.

The latest rules, drawn up by the Donkey Sanctuary in Devon and endorsed by the British Equine Veterinary Association, are targeted at all local authorities with beach donkeys – including Great Yarmouth, Brighton and Torquay