Where did your earlier reply disappear to, John... I see you've started a different thread.
Are you certain it was solid fuel now?
If so, some of the info below referring to oil-fired AGAs may not be relevant.
I can't see a scuttle being present in the kitchen if it wasn't used.
It depends whether you believe ngb or not, and I know buddy once referred to a police statement which stated that the AGA was lit.
Although I don't have one now I have past experience of two Rayburns and these were always filled through a hole left by a removable plug in one of the hotplates on top, and AGAs are filled in the same way via the left-hand boiling plate plug-hole (see the 3-dimensional cut-out view in an earlier post and the photos below).
They are only filled, say once a day anyway, so removing and replacing pots and pans is no problem.
All solid-fuel AGAs have a rudimentary thermostat lever on the left to control temperature... the slotted vent at the bottom is just that, an immovable vent.
Yes, all the circular plates are removed for maintenance, but the central portion is a small plug removed for filling only.
Youtube has a few informative servicing videos on the subject.
http://www.youtube.com/watch?v=Vvq-gLVVN7YAny long implement other than just a rifle end could have been inserted through this hole into the hot coals or failing that via the ash-door on the lower front face, into the hot ashes or the grate just above them (assuming Nevill's body was not in the way).
If the AGA was set to low then this would bring any metal up to temperature more quickly than putting it into one of the ovens on the right.
The earlier oil-fired vapourising jet boilers (unlike more recent pressure-jet ones) have to be on continuously... they are not like ordinary modern oil boilers which can be turned on and off in an instant. AGAs rely on constant heat input to keep the solid heavy metal structure hot if they are to run efficiently, (much like an electric overnight storage heater retains heat in firebricks).
This applies just the same with a coke-fired AGA.... you prevent them from going out by keeping them regularly filled.

