Gas appliances can be an extreme hazard and it is strongly inadvisable to attempt repairs yourself, please call a Gas Safe registered repairer.
If you are even vaguely hesitant about gas and cannot do a drop test DO NOT INTERFERE WITH IT! I cannot stress enough that safety around gas appliances, especially in a kitchen environment where there are naked flames and red hot electrical elements is absolutely paramount and mistakes can mean death and/or injury.
Any gas appliance is not a job for the unskilled or the DIY'r.
If you smell gas in the kitchen, isolate the appliance/s and call a qualified engineer or gas repair service, do not attempt this yourself.
All gas cookers should have a "bayonet" type fitting which, when you disconnect it (twist and pull) it acts as a safety shut off valve to the appliance. Gas hobs should (by law) have an isolation tap fitted although these are often out of sight in an adjacent cupboard or on the supply pipe to the hob somewhere. Some kitchen fitters and installers do not install these and it is highly inconvenient when things like this happen or for service and any engineer calling may have to fit one at your cost.
Please bear in mind that a gas soundness safety test is absolutely essential after any repairs.
Due to the danger presented in dealing with gas appliances it is UK Whitegoods policy to only supply spares to competent Gas Safe registered operatives. This is purely in the interest of our customers safety. This is not done through any sort of policy on trying to retain work or hinder people, we just do not feel that without proper testing after a repair that we can be sure that people have made safe. Frankly, we don't want people's safety to that degree on our conscience.
However, with a Gas Safe card (or any other appropriate gas safety scheme form of identification) we will happily supply any spares required.
We are well aware that other websites and many traders do not adhere to this sort of policy and we also fully realise that it probably loses us business but we would far rather lose a few pounds than be a party to someone losing their life.
We can and do supply any spare parts that do not involve the gas supply as these are perfectly safe normally to replace, or at least, no more dangerous than any other spare part.
So pot stands, burner caps, oven door seals, shelves and so on and perfectly okay to be supplied as normal.
It is worth noting though that some cookers and, especially, hobs DO require the gas supply to be interrupted to even access the appliance. If you're not sure please feel free to ask in the forums where one of the engineers will advise.