watercourse

"Any confirmed unauthorised activity is assessed for potential harm to the watercourse and surrounding environment, and enforcement action will be taken where appropriate."

And in May, the company was ordered to pay £350,000 after a watercourse in North Yorkshire was polluted with sewage.

According to the Environment Agency, electric bikes pose a pollution risk because the batteries contain substances that can enter a watercourse if they remain submerged in water.

The airport said in its email to Mr Thornley it was working with the EA, which was "now happy the issue had been resolved and there were no further impacts to the local watercourse".

She argued it "would be better spent on upgrading water treatment plants beside watercourse in Wales".