Popped into Swindon on my way through on Friday and got one of these...
Yuasa 12v 85Ah 800A Silver Car Battery YBX5110 HSB110
Helpful guys, I borrowed a screwdriver to remove the plastic bits on the base plate to get it to fit properly and they even gave me some foam packing cut to size to fit the lower profile of the battery. Car now starts immediately with no flickering dash electronics.
Once fitted, the boot refused to open, so after following the reset procedure in the manual, got that working again. Then drove down m4 m5 to Exeter, put stuff in the boot. Boot then locked itself. And refused to open. Headed back via Dorchester, in the hope of popping into Olds, as couldn't find the emergency boot release under the passenger seat. Olds is now long gone so that wasn't too successful....
Drove back up to Berkshire, fortunately with no problems. Almost out of fuel when I got home... and discovered that fuel filler cap was also locked. Fortunately the 57mpg motorway capability of this car @ max speed saved my bacon on this occasion.. thanks to Gus for his efforts!
Next day, collected some advice and a couple of seat fasteners (which you need to replace when you pull the rear seat up) from Alfa Aid... and finally located the emergency boot release and got the boot open. I also followed their full reset procedure (short out the car circuits), tested the fuses etc but no joy. The emergency fuel filler release doesn't seem to work either. So I guess the car will be going in next week unless I can get it working today somehow.
Next steps I guess are to check for error codes and reset those if there are any... maybe fight with the trim a bit in the boot to try and get to the various components and check out if anything is broken there although I suspect not. This is just from removing the battery from the car... wouldn't be surprised if I need a new body computer
'Keeps you busy dear' says my better half and I have to say that after a few years away from Alfas I am reminded just how true that is