Trouble shoot :- no power for fridge, lights etc

Please can anyone help?
Had a couple of blown fuses on the internal lights, easily solved but surprised they have blown as I was only charging my phone and iPad. Then I turned on the fridge Saturday afternoon, let it run until it switched off at 14.00 the next day. Now the Camper King switch board won’t turn on.
I have checked all the fuses and used a multi meter to check I am getting power from the life battery to the main electrical box (see photo with cover off) I have not a clue about electrics, any suggestions in a languid can understand would be appreciated.
Thanks very much.
 
When is the main leisure battery?

Got any pics of that?
 
CK special, the battery is at the bottom of the last photo.
There should be a fuse as close as possible to the leisure battery positive (+) red terminal. That said I don’t see one in the photo.
For some strange reason there are blue cables which I would think are normally negative going to both battery terminals???
 
Gentleman, thanks for the communications this far. I’ve not been on the site long and I’m amazed at how helpful people are.
Strangely I couldn’t find a fuse near the positive lead near the battery.
I’ll take a look again tomorrow. Cheers 🫡
 
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