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Unless it's a light bulb, lol

The first thing to do is IR test the supply cable from the 300ma rcd to the dis boards. Is there a TN earth at the cut out ? Is the cable 2 or 3 core ? swa ? Is there tails you can clamp around at the source of the 300ma rcd I'm assuming it's swa buried to the caravans then a post with earth...

He's going to spend money, even if he decides to have a go himself and buy a cheap mft and then learns how to use it.

I had this fault the other week 300ma time delayed sub main feeding a main building from there 100ma time delayed feeding 4 other buildings each having their own CUs all rcbo Kept randomly tripping the 300ma turned out that there was n to earth leak on the main swa cable and a n to earth fault...