Some good advice there: http://news.warwickshire.gov.uk/blog/2015/09/16/fire-and-rescue-service-pledges-its-support-for-gas-safety-week/

We haven't got gas. I had it taken out just after we bought the house and we nearly died from carbon monoxide poisoning. Don't miss it at all, but I do worry about having my eggs all in one basket.

We have both gas & electricity, and make a point of having the boiler serviced every year.