A Scottish school has clawed back nearly £50,000 from its old water bills after a billing mistake was uncovered.

St. Mary’s Kenmure in Glasgow which takes care of children referred to it by the courts was incorrectly charged for surface water drainage that wasn’t its responsibility.

Scottish Water’s company Business Stream said it paid the many back as soon as the error was discovered.

Graeme Nixon, Director of Customer Experience at Business Stream said: “After it was discovered that the property drain element flowed directly into a natural watercourse this charge was removed and the account was credited.

“We were happy to remedy the issue and if customers would like to discuss any aspect of their water or wastewater services we would encourage them to get in touch.”

Energy consultancy Utilitywise which uncovered the school’s over payment said the case showed large firms aren’t the only ones who can get money back for wrong bills.

Tim Hipperson, Energy Service Director at Utilitywise said: “There is a misconception that only big companies like supermarket chains are able to make claims like these but it’s estimated up to 90% of commercial water bills are mischarged.”