On Oct 20, 8:18*am, hazchem wrote:
I live on the ground floor of a block of flats in London. I came back
to my flat from holiday and immediately noticed an unpleasant smell. I
thought at first it smelled like ripe cheese like camembert but later
I thought it smelled like sewage.

It seemed to be coming from a storage area where the gas meter is. I
removed everything in the storage area and these things do not smell.
The storage area still smells though. I don't really know what gas
smells like do I don't know if I have a gas leak. There doesn't seem
to be any dampness as far as I can see.

What should my next step be? I don't want to have to put up with the
smell forever.

Get off usenet and call the gas company emergency line, leaks only get
bigger. A house here blew up about a month ago (Frankfort IL) at 5:30
AM when the owner (they think) flipped a light switch. The house was
completely gone and the explosion heard for a 4 mile radius, adjacent
houses were seriously damaged. NG is odorless so they add a chemical
that smells like the rotting cheese you described.