Sorry about that: It is a large home appliance with 4 (round) gas
surfaces on the top to heat pots or pans I think that bit is called
a range though I have heard the whole thing referred to as a range,
which I thought confusing. Which is why I called it a cooker and
thought that people would realise by the reference to grill igniters
and ovens not working what I was talking about.

Underneath there is an oven which has two trays in it which go from
side to side to put things like chickens or beef or indeed fish on.
The oven heats up the food inside it by tw menthods: It either uses a
grill at the top under which you put the grub or an element of some
type under the lower surface which heats up the whole oven to maintain
an even tempertature. Either seem to use an igniter to which I
referred in my OP . Both igniters (they used to be called pilot
lights when they were actual flames) went out at once and the grill
one seems to have reset itself. My problem is that the oven one
doesn't now turn on at all.. There is of course a 50/50 chance that
the oven igniter needs replacement but as they both went out at once
and one then started working again, I figured this is slightly less
likely.

The whole is controlled by an LED panel at the front surface (to the
right of 4 round knobs which control the top gas 'burners') which
shows mode, temperature, grill on/off etc. There is also a self-
cleaning function.

There is also a drawer underneath but I don't think it does anything
besides holding roasting pans: It doesn't ever seem to have acted as a
warmer drawer.

(Where I come from, this whole appliance is called a stove but I didnt
want to use that term as i hadn't heard any one use it for years)