Eco-friendly toilet paper brands are selling bamboo loo roll containing as little as 3 per cent bamboo, according to UK consumer group Which?.

Unlike the trees that traditionally go into toilet paper, bamboo is a type of grass that can grow quickly even in poor soils, which means harvesting it does less long-term damage to the environment. For that reason, bamboo-based paper has earned a reputation as an eco-friendly alternative to regular loo roll. But fibre-composition testing suggests some…