By "knob" do you just mean the knob on the front control panel or do you mean the gas valve itself?
Sounds lik ethe gas valve is leaking - one would be tempted to suggest you get a Gas Safe certified engineer to look at it
http://www.buyspares.co.uk/belling/cooker-oven/hob-gas-valve/product.pl?pid=1908964&shop=belling&path=112737&refine=valve
acp
April 2017