The never-ending story of bad grounding information.
Follow Yaesu's advice in the new FTX-1 manual (accessed online, 14/06/25) if you have a PME supply and you would contravene UK regulations. During a neutral break, your house may burn down as your ground rod becomes the sole path to ground for several houses around. Your home insurance would be invalidated.
For PME, you need to also install 10mm2 (min) earth cable directly back to the incoming mains*.
*This is my info, not advice.