Hi Chris,
Most likely the ignition unit is faulty -part no 11550240
you can get this from MFI their E-Mail is mfs.extracareparts@mfi.co.uk. The part is easy to fit remove all burner tops and knobs, remove all screws and the top lifts off. Make sure the power is off. You do not have to touch the gas side at all.
Ed
July 2005