A report funded by the UK space agency suggests a link between peak tourist periods and algal blooming at Windermere in the Lake District.
Algal blooming is caused by warm temperatures and nutrients, and can make the water green and toxic.
Campaigners are linking the blooms to discharges of sewage, which although mostly treated, are nutrient-rich.
United Utilities, the local water company, insists its wastewater plants can cope with peak tourist periods.
And given the utility in question is United utilities I’m not trusting a single thing they say.