All new Gas hobs sold since May 2010 have FSD (Flame Safety Devices) fitted to automatically shut the gas off in the event of the flame going out. Basically a thermocouple linked to a solanoid valve which triggers if the temp drops (no flame).
Older Gas hobs may not have this.
You can check to see if your hob is fitted with a FSD. If you look at the ring you will see the igniter (a small ceramic cylinder with a metal tip usually) which sparks to light the hob. The FSD looks similar but is normally conical in shape and metalic instead of ceramic.
My Neff Hob has FSD fitted as well as electronic valves with child locks. It works very well and if the flame is out for more than 5 seconds then it turns the gas off to that ring.
You were lucky if you left the gas on for 23 hours and diddnt blow the place up!
/Salsa
Thanks for that, answers my question beautifully. I dont have the thingy and ive just tested it now and it didnt turn off on its own. Lesson learned (Hopefully)
I despair.
Bit harsh, no? i know how i did it, had a few pans on the go and must have had the frying pan on low keeping something warm due to bad timing and while dishing up i must have thought it was off.
Worst I stayed out all night and so didn't know my hob was turned on but now you're questioning to yourself where I was ever thread.
Jus' saying.
lol, my days of going out on the lash when its a school night are well and truly over, kills me getting up at 5:45am as it is.