I had this problem some years ago, it stuck in causing a serious incident. Get it looked at as recommended by the Prof.For safety you should arrange to have the hob checked by an approved gas engineer.
All good. Embarrassing moment as I was trying to light the heat plate on the hob🤣. That’ll teach me not to have too many beers before trying to cook.
Most of us have been there and done that. Mrs H said the Califlower cheese is taking ages to cook, she had it in the main oven, but had the grill on. Oh well another bottle of wine.