Thanks all.
I've always said that electrical isn't my strong point and I keep proving (learning) it.
After reading all the information (some times 2 or 3 times) it's now clear that I haven't wired up the plug (merit)for the fridge correctly.
I think I ran 3mm from a junction box to the plug. Battery is in the back, positive runs to the junction with around 12mm wire.
Pretty sure everything else is OK, as they're USB charging points or switches.
So looks like 6mm wire is the correct way to go for the fridge. Thanks.
Some of the other points that have been mentioned have played a part in this, but that is just me asking too much from a battery.
Again thanks to you all for the info.
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