The last thing I did offline was check my boiler. We have been having issues with the fan not kicking in as it should when we use the hot water and the heating, and today, my daughter smelled gas, so I had to go and check and contact the plumber. 
Seems it is fine and nothing to worry about, it is due to the fan not kicking in as it should, there may be a slight smell, but it's not gas and not dangerous, so I am happy about that!