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How can I mend the main oven of my Chester 1054-5G?

The hobs and top oven and grill are working fine but the main oven is not sparking, nor is gas being fed to it. Can anyone help ?
It has not been used for a month. Previous to this there was an intermittent 'fault' when, whilst the oven was on, it would keep clicking trying to ignite the already lit main oven.
Many thanks.
Annabel, January 2010