By Mariam Khan Homeowners are being warned that they should act immediately if they notice a rotten egg smell in their homes. The stomach-churning smell could be a sign of something going wrong in your home. Experts have warned that it could be an indicator of a dangerous gas leak, which could put households in serious peril if not addressed. Nearly 23 million homes in the UK use a gas boiler for central heating and hot water supply, but failure to keep the apparatus maintained properly can lead to a range of problems \- from carbon monoxide problems to gas leaks, The Daily Star reports. James…