There are long queues for people trying to get on site at the Great Dorset Steam Fair.
The event at Tarrant Hinton near Blandford starts tomorrow but heavy showers have made it difficult for vehicles trying to get on and move around the site today.
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In the first recorded case of its kind, staff on patrol discovered the three rodents just inside the perimeter fence at HMP Guys Marsh.
The League Two club has lost 10 of its last 12 games and is now hovering above the relegation zone.
Cloudy later in the South West with light drizzle in some areas.