Police are trying to find Mayka Marica Kukucova, the former girlfriend of the Bristol businessman Andy Bush, who was shot in the head in an ambush at his mansion on the Costa del Sol.
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The series filmed all around Bristol and other parts of the West Country.
Sutton Harbour has been evacuated after a fishing trawler brought the device into port after catching it in its nets
The flat in Chippenham's Market Place remains cordoned off, while authorities investigate the cause of the explosion.