We had 5 calls within 10 minutes from someone who said he worked for the Gas Board (doesn't still exist). Told him politely the first time that the grant he said we should have was note wanted when asked how he got our number he said it was given to his company by the government.
After the second, third and fourth call my usually placid husband told him to leave us alone at which point the asian guy told us in that case he would stop all gas and electricity to the house.
He gave us a phoney telephone number. Just to warn people
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