Parkinson Cowan gas oven not coming on?

Hi there, I was cooking some food in the oven when I heard the electronic ignitor sparking. For some reason the oven had gone out and now wont light as there is no gas coming through when I turn it on. Have checked the hobs and grill and they both work fine. Seems like the gas is not being allowed through to the oven for some reason. Someone told me it could be that the FSD has shut the gas off and this has to be reset manually but I have no idea what to do. Any help would be appreciated. thanks