Any idea how much this could cost?I did wonder if the jets were dirty,this happened to me when I had a gas cooker and the man who came ,brushed it with a wire brush...did the trick, but it hasn`t for her.
At the back, on the bottom of the oven is a small thick tube. This should be in the pilot flame, when it gets hot enough it will allow the gas to go to full, sometimes it's located so the "low oven " flames heat it up. Look carefully with a torch, not a naked flame, it might have dislodged whilst cleaning the oven. Restore it to it' position and continue. Otherwise , replace. Use Corgi registered repairman only please.