By Ann Dixon & Benedict Tetzlaff-Deas An 85-year-old man has spoken of his shock after receiving a massive energy bill for just under £23,000 from British Gas \- despite him spending much of his time living abroad. Charlie Walton lives on his own in Pegswood, Northumberland, and spends half of the year in Spain. The dad-of-two couldn’t believe his eyes when he received an electricity bill through the door for £22,897.48. British Gas told him that he had to pay the sum in less than one week. He said he received the letter on Saturday, January 20 and the figure needed to be paid by Friday, Janua…