National Grid - Gas - letter confusion...

Received an important-looking brown envelope from national grid saying (on the outside) that the gas supply was going to be cut off. Inside, the letter said that although there would be a lot of work going on the street "there would not be any interruption to the gas supply"! 
So which is it, am I going to be cut off or not?

So which is it, am I going to be cut off or not?