If this is a wall mounted box and the cables are entering from below (or behind) then your best option is a double pole Henley block for L & N and a single pole Henley block for the earths inside a suitable IP67 box.
I do as it happens have an IP67 plastic box in the garage with which I could put a Henley block within and an Earth MET block.
I did wonder if 10mm2 was too thin for a Henley block as meter tails are typically 16mm2, 25mm2 or 35mm2.
This is for my wood store and greenhouse.
I now also need to find a IP65 CU that will accept RCBOs....
The SWA enters the back of the wood store and the CU is to go just inside the door (so needs to be weatherproof) so the JB is on the back wall and was going to use the meter tail kit to connect the SWA to the CU.
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