In reply to Tringa:
> If possible find where the gas supply comes into the house and have it capped off as it enters the house, so if there are any leaks in the future the gas stays outside.
Not good if the boiler is gas
Worth seeing if the gas fires need an electric supply to work, most gas boilers do. Frustrating in an electric power cut.
> Are these gas fires in fire places, ie there is a chimney and chimney breasts? If so, you could remove the the chimney breasts to give a bit more room, but its a big job requiring support for the upper floors and it how it might affect neighbours, if applicable, needs to be considered.
Depends on the house room sizes and location but an open fire or wood burner is good for emergencies and can enhance the house value . Can just be for effect or occasional use.
> I suggest needs to be done by someone who really knows what they are doing.
Hetas , gas safe or building control.