You could take the top off the appliance and gain access to the wiring to the clock.
Once there, it's possible to rewire it to bypass the clock/timer.
You'll need the actual model number, this is the 4 numbers on the top line of the label.
Normally seen when you take the drawer out.
Is it all electric? dual fuel? or all gas?
I would need the model number so I can see if I've got anything on it.
No, you have gas hob and gas ovens.
It's the 4 digit number I need from the label on the appliance.
There are a few 110 green appliances and they have differences to them, normally in the wiring.
OK, thanks for that.
You now need to isolate the power and take the top off the appliance.
Take all the burners out and you should find some screws under the burners.
You also need to take the screws securing the flue grill to the hob top.
These are accessed from the rear.
Once this is off you'll find the hidden screws holding the hob top on.
Once you have access to the timer wiring, let me know.
Let me know what you have connected to the clock and let me know what markings are on the clock connections.
Yes, bypassing the timer will make the oven work.
Turn the power onto the appliance.
Press and hold the 1st 2 buttons on the left.
While holding them, press the + button.
Does the machine come off of auto?
Yes, the screws do need the machine pulling out.
One more thing for you to try.
Pull the buttons out of the clock.
Clean them and put them back in.
I said previously buttons 1 and 2, the user manual says buttons 2 and 3.
Try pressing and holding 2 and 3 and while holding press + or -
Good luck with it.
All gas appliances have a safety chain.
You can pull the machine out so far and then unhook the chain.
Sorry it hasn't worked for you.
If you can't move the appliance and take the top off I can't help on bypassing the timer.
No Corgi anymore by the way, it's now Gas Safe Registered.