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Jess and Norma were also regular visitors to Marshall's Yard shopping centre in Gainsborough, Lincolnshire, where they switched on the Christmas lights last year.

A spokesperson for Gainsborough Care Home previously said they were "deeply saddened" and were "fully co-operating" with lead agencies.

Once every three weeks, Adelaide Coupland drives the hour and a half from Leeds to her mum’s home in Gainsborough in Lincolnshire.

Dorset Police said earlier the deaths at the Gainsborough Care Home in Swanage, were being treated as "unexplained" but potential carbon monoxide poisoning was the "primary line of inquiry".

Gas distribution company SGN said it was called to Gainsborough Care Home earlier on Wednesday.