Nottinghamshire Police say a protest by 15 campaigners, staged inside two chimneys at West Burton power station near Retford, is costing £20,000 a day to police.
The campaigners say they plan to camp inside the chimneys for a full week and this morning have taken to flying kites and tweeting pictures.
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Mary Ragoobeer and her sons, Shane and Sean, were killed in the blast in Leicester on February 25.
Dry, with increasing amounts of warm sunshine.
Dry, warm and sunny on Friday, and Saturday morning.