Gas Cookers, Ovens and Hobs are not supplied with a gas hose.
There are a couple of primary reasons for this. Firstly, under current legislation, any item which is to be connected to a household gas supply must be installed by a suitably qualified and certified Gas Safe fitter, who will provide the correct cable for the job. Whilst it may be tempting to install items yourself, doing so will invalidate your Warranty, and possibly even your Household Insurance. Secondly, there are two different types of bayonet attachment in common use in the UK, so it is pointless supplying a hose for your gas fitter that would not fit the gas pipe in your property.
It is normal practice for the gas fitter to supply the gas hose when installing the product.