Belling”fastlite”glass ckr model r’d off need E. R

Belling free standing cooker.Model no. burned/washed off. Green w.brass handles, dual grill, top and main oven and bit wider than standard plus glass hob. Left front “fastlite”plate looks ceramic not halogen. Small size ring. Took off side panel, peered inside and could see back of regulator is black plastic with something whitish/ cream coloured circular “en-caged” in regulator body. Pulled knob off front to reveal white 1/4″ plastic spindle with flat. Hope someone will recognize this description. Don’t want to undo bit rusty front until have part if possible.
Thanks,
Mike.