I've just come up to go to bed and my bathroom/landing smells very strongly of rotten eggs. I also thought I could smell gas. I do not have gas in my property. I've got myself worried and don't really know why. Does anyone have any clue what it could be? I'm winding myself up imagining gas explosions which is ridiculous as there is no gas. What else could be causing the smell? Bathroom / toilet is clean but it's such a strong smell