How Can I fix fault on Rangemaster Toledo 90 dual fuel cooker?

Fault diagnosis for Rangemaster Toledo 90 Dual Fuel?

My oven developed this problem litterally over night :

Gas rings work fine and starter works fine.

The electric oven worked but wouldn't get hot and the grill would come on but not get hot.

When either the electric oven or grill were switched on the main clock/timer display would dim , also some of the switch lights would come on and off , oh for good measure I started to get the odd shock off the oven when I touched the main wall power switch (has a metal surround) !!

Two weeks after develping this fault the oven does not come on at all now, neither does the grill, the display still dimmers when either grill or oven is switched on.

I have spoken to two engineer who said it sounds like the clock/timer unit that needs replacing and that a faulty unit would cause these symptons , they didn't say it would casue the shocks that I've been getting.

I have also been advised by an electrician that the faults combined with the shocks I've been getting suggest a power supply issue , bad earth /connections to oven or from wall socket , I've checked wall socket connections and they seem ok.

Anyone have any advice ? If I can find the clock timer unit i can replace but don't want to rick replacing a part that I'm 100% sure if causing the problems.

Cheers