Are you starting now to get it ready for next Christmas?This one is where I think ill fall short of @noseall

A bit too seasoned. Its not even that old. It is however its first proper cleanThat looks "seasoned".
Remember it gets sterilised every time you switch it on.
This one is where I think ill fall short of @noseall

Its an ok oven. It does all sorts of things.Your main oven has two fans, by the looks of it. I've not seen that on a domestic oven before.
Air fryer and a few other bits and bobs.

Not sure what half these do.That's interesting. Is the air fryer in the top or bottom oven?
An air fryer is really just a fan oven with a much more powerful fan. Maybe air fryer mode makes the fan(s) spin faster.
Not sure what half these do.
This is the top small oven

I can imagine it was cleaner than mineThanks. Very interesting. Our double oven is quite old and is just a basic fan oven underneath with a normal oven/grill on top.

Last time I did this I had a kit that come with sip up bag.A good tip -- use BBQ cleaner kit with the zip up plastic bag and put everything you can fit in there and leave it overnight, makes light work of the racks or any internal panels.
Places like B and M and Home bargains have them as do most supermarkets.Last time I did this I had a kit that come with sip up bag.
It seems however that Noseall started a trend locally as this kit was sold out.