Ok I'll come clean sheriff, no one is at risk here,
I know where that wire goes.
Its a TT system, Ra=33ohm . The tail is there for the DNO to attach to the PEN PME or what ever you want to call it. When someone gets round to asking them to come and do it.
I'm just at the site to restore power to the poo pump that the electrician (who left his name and number on the label ) disconnected when he installed the shiney new box and found a bit of earth leakage.
The pump was supplied from a JB on a radial socket circuit hidden under the bedroom floor.
He wasn't to know, he thought rats had been under there so he dissconnected at the next to last socket where he cleared the fault and went home happy the little old lady was now protected by 2 lovely RCDs.
Trouble took a while to rear up its ugly smelly head.
The real question is where is the earthing electrode.
When I was at the site I couldn't see it so I texted the electrician.
The spark said it was buried under the extension.
All I could see was EQ bonding to the oil pipe with no plastic jacket dissapearing into the ground and the EQ to the water circulating pipes.
Do you think the hidden electrode and the EQ bonding will take the fault current should someone start yanking on the line tail so that it chaffs and contacts the box. I=V/R 240/33=7.2727A
I think them wires will carry that current for quite a long time.