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you say the battery itself is fine, have you had the charging system checked, i you hae a multimeter you can do it yourself, connet the multimeter to the battery, then check its reading with the engine running,it should read upwards of 13.5Volts, then turn on all the electrics, check again, it should still read over 13V at least, bring the engine revs to around 2000rpm, or driving speed if you dont have a rev counter it should go up to 13.5 upwards again, if its lower then theres a fault in the charging system, this could also have been caused by the fitter

I think you are barking up the wrong tree with the fridge feed. The battery is not holding it's charge without the van connected, therefore, something in the car drawing a current, highly unlikely unless as Jennifer says a light is left on, possibly in the boot or somewhere  not visible. If the fitter had cocked up and shorted something somewhere, then it would draw so much juice it would blow a fuse (or catch light). Finally, battery knackered which I would think is the answer.

As for the fridge feed, don't know if mine is standard but I wired it myself thus:

Connect to live terminal of Battery (+) to in line fuse to  relay switch (closer to battery terminal the safer) . Relay switch to S socket. Alternator to relay switch.

Therefore fridge runs direct from battery but only when the alternator is generating a current which operates the relay and charges the battery at the same time. As soon as the engine stops then the fridge is disconnected from the battery. This is how I was advised to connect by the auto electrician at our local Halfords and havn't had a prob yet. If anyone thinks this is wrong, please tell Halfords not me!...Mick

Does the boot light go out when lid is closed?

Dont trust the Scotch lock connectors they tend to cut the cable strands.

There could be a fault with the 12s relay unit so that its pulling current all the time.

Why not try unplugging the relay and see if the battery still goes flat.