I wonder if I should've even asked the question, that's if anyone can even remember what it was.
I don't intend to disconnect any safety features but I ask myself 2 things. If the cut out is simply to stop the glass lid cracking while the oven (only) is on, why don't manufacturers use a more heat resistant material?
Secondly, If that isn't the reason why don't they just have the cut out operative only when the lid is down?
(Even when our oven has been on the area around the gas rings certainly isn't anywhere near hot, barely warm in fact)
I refer you to my answer in #7.
Whether a gas interlock cut off is needed depends on the design of the installation. Whether its the appliance manufacturers duty or the installer (caravan manufacturers) duty to fit such a cut off depends on the choice of appliance and the installation. as for choice of materials that will be down to the party that designs the installation in consultation with the relevant regulations.
From a kitchen perspective, a glass lid is a hygienic choice, its easy to clean but it also has a greater risk of shattering, but in this application it also has to cope with heat, which limits the type of glass that can be used. So it's a restricted choice of materials that might be suitable.
Hobs are not always integril with the oven, so again the choices of how the interlock will work will be driven by the type of installation designed by the caravan manufacturer.