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The only real thing you can do is check the connections with a voltmeter. On the leisure battery side you should see 12-ish volts on standby and 14-ish volts when the engine is running. On the input side you should see 14V when the engine is running. If you don't you need to work your way back to wherever it connects in to the vehicle electrical system.
If you see >14V on the input but only leisure battery voltage on the output, the charger / switch relay is dead.
Plus there's probably some fuses on both sides, or the battery itself could be toast.
grams
Leisure battery doesn’t appear to be recharging properly while I’m driving. Any good pointers for trouble shooting? Only got about half an hour of one small light being on before the low battery warning light clicked on.
The power supply is all factory from the motor home fitters that originally built the van so would hope it’s all relatively straightforward and not some crazy diy affair.