I'm a clever s**, aren't I?

You're looking at a Remote Keypad aren't you not the panel itself.

I wondered but then thought surely he can work out the size of the battery versus the size of the keypad wont work?

In regards to the Ferarri quote, I think the message is that some people, even if well off get some sort of satisfaction out of solving a problem themselves, rather than a 3rd party...and, unless you own a Renault.....it's pretty easy to change a lightbulb on a car.

Still not really the same comparison, an ab 72 has 140 zones that's a lot of rooms, if own a house that big Id have someone changing my light bulbs for me, and Id be getting my satisfaction elsewhere

The only one I've seen is on the inside of front panel next to the LCD.

That was the clue, the second screw is out of site under the 'key surround'.