Freestanding gas cookers tend to come in one of 3 available widths, 50cm, 55cm and 60cm wide. In addition to this you can narrow your search down by deciding if you would want one which has a self cleaning option available on it.
They come in a variety of set-ups including a single main oven cavity, main oven with a separate grill cavity, double oven and oven with an eye level grill. This combined with the various widths gives you full flexibility to find a suitable cooker to fit in your kitchen.
Any gas appliance such as these gas cookers will need to be installed by a Gas Safety registered engineer to ensure it is correctly and safetly connected.