I think the interior lights turn off anyway after a few mins - not sure about the boot lamp.
Well, this turns out to not be correct! I'm sure I've experienced the map reading lamps turning themselves off, but maybe I'm thinking of a different car.
Turned out the issue with daughter's car is granddaughter had turned on the rear interior lamp. I'm annoyed with myself for not suggesting checking it earlier and she's annoyed for not thinking of it too - she's normally pretty good with car stuff.
It would have been nice if the random recovery guy that Honda Assist had sent had checked on Saturday. Car was dead again on Sunday and I got her to check then and the lamp was still on. She was busy with other things on Sunday so called Honda Assist again mid-morning today (Monday) and they sent a proper AA patrol who did a much more thorough job. I was quite concerned as the battery was so flat this morning that the central locking wouldn't work and radio had lost its code, but he checked the battery condition and pronounced it OK. She's here tonight and after a few hours standing I checked the voltage as mentioned above and it's exactly 12.6V, so fingers crossed.
I've never had occasion to pay any of our Jazzs batteries any attention before but it really is dinky, isn't it! Here's is a Varta, 35Ah.