Hi, Don't worry, it is legitimate! There was an advert/article in the Groat a while back about this scheme and letters have then been delivered to all gas users in Wick and Thurso. We've had the check in Thurso by a guy from Everwarm who SGN have subbed the work to. It's all to do with them needing to ensure the network and appliances are safe and suitable for different types of gas (or something techy like that - the Everwarm guy explained it to me!). The engineers all carry ID and basically you are just getting a free appliance test and a carbon monoxide detector. You can ring and make an appointment for them to come if you don't just want them popping in, the details should be on the letter.
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