A volunteer at an award-winning nature reserve and mill has bemoaned the actions of a group of travellers who broke into the site and left bags of rubbish in the meadow.

Police confirmed on Tuesday that travellers – thought to be a group of about seven families in caravans – had set up camp at Meadow 2 at the Stotfold Watermill and Nature Reserve on Sunday afternoon.

Volunteer Pam Manfield said: “Such total disregard for sensitive wildlife sites, the result of thousands of hours work from local Teasel volunteers, is unacceptable.

“While they did collect up most their rubbish before leaving on Tuesday afternoon, it was left in black bags around the meadow.

“They also defecated in several places in the meadow, not even bothering to bury their faeces.

“Visitors, especially with children, are advised to be especially careful around the edges of Meadow 2.”

A group of travellers was also spotted by the entrance to the Baldock Service Station – at Junction 10 of the A1 – on Sunday morning, but it has not been confirmed whether they were part of the same group.