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That term isn't used in the regs but I take it to mean a location where a different potential could be introduced via an extraneous conductive part.Would this count as inside the equipotential zone?
From your photo's I'd say you aren't in a position where a potential can be introduced from something sunk into the ground when you are stood on that same ground.
I'd work on the basis you have simultaneously available exposed conductive parts.
Reg 410.3.2 suggests that additional protection wouldn't be required notwithstanding special locations or external influences, so doing nothing at all seems to be a valid option.
The next step would be to apply section 415 anyway, and without RCD protection you end up providing supplementary bonding between all of the exposed conductive parts, sized according to 544.2.1
I'm not immediately seeing any mandate in the regs to go a further step and add all accessible metalwork to the bonding. I'll happily be corrected though.
I also can't help wondering if it wouldn't be a lot simpler to sort out the RCD protection for everything in the area. I'd also try and avoid the post staying as an exposed conductive part if at all possible.