Lin Lawler, 70, owns Grange Farmhouse and an adjoining annex in Hainford, which she rents out as holiday lets for around 100 days a year.

But her supplier, SmartestEnergy, slapped her with an annual bill of £24,010, leaving Miss Lawler in fear of bankruptcy, despite an engineer condemning her smart meter as faulty.

Now, while in the middle of an

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