From the British Gas website: << Before visiting your home, our representatives usually make an appointment but meter readers or meter operators may call without prior arrangement. If someone unexpected calls, remember ?Lock, Stop, Chain, Check? (see page 10 for more details). All our meter reading agents carry an ID card, giving a freephone helpline number so you can confirm their identity. Never feel embarrassed to phone us to confirm that a representative is genuine. A British Gas representative expects this and is happy for you to check. By following a few simple guidelines, you can help protect yourself and your home. Before you open the door to anyone, remember: 1 Lock 2 Stop 3 Chain 4 Check Make sure all outer doors are locked. Stop and think ? are you expecting anybody? Before opening the door, always put the door chain on and look out of the window or spy hole to see who is calling. Make sure you check their identification ? don?t be afraid to phone the company or organisation the caller says they are from to check their validity (obtaining the number from an independent source, rather than taking it from the caller?s ID card).<<<