EV car parked within 2.5m of metal fence

First, it depends where the fence is. If the fence is for a substation compound or similar, or an electrified railway line, then you will need to speak to the owner of the fence to determine what is safe (as it is usually part of the HV design). Similarly, if it's at a water industry site, WIMES guidance might require a particular bonding approach.

Second, it depends if the fence is connected to exposed-conductive-parts of another electrical installation connected to a different earthing system (for example, if it has CCTV, lighting or access control equipment attached). If so, Regulation 411.3.3 applies, and 2.5 m separation from a vehicle on charge is absolutely necessary. Usually, good practice for preventing contact is the erection of a wooden fence between the metal fence and the parking space, of sufficient height to prevent simultaneous contact with both the metal fence and the vehicle.

Finally, BS 7671 (since 2008) only requires protective bonding in buildings. If neither of the above situations exists, then it could be more dangerous to bond the fence than not bond it.

However, I'm looking at the location in the photo... you said it would be TT, ... I therefore assume you'll be providing physical separation from the metal-clad building too, as that's almost certainly connected to exposed-conductive-parts of the PME system ?

Most of the above is covered in the iET Code of Practice for Electric Vehicle Charging Equipment Installation.

First, it depends where the fence is. If the fence is for a substation compound or similar, or an electrified railway line, then you will need to speak to the owner of the fence to determine what is safe (as it is usually part of the HV design). Similarly, if it's at a water industry site, WIMES guidance might require a particular bonding approach.

Second, it depends if the fence is connected to exposed-conductive-parts of another electrical installation connected to a different earthing system (for example, if it has CCTV, lighting or access control equipment attached). If so, Regulation 411.3.3 applies, and 2.5 m separation from a vehicle on charge is absolutely necessary. Usually, good practice for preventing contact is the erection of a wooden fence between the metal fence and the parking space, of sufficient height to prevent simultaneous contact with both the metal fence and the vehicle.

Finally, BS 7671 (since 2008) only requires protective bonding in buildings. If neither of the above situations exists, then it could be more dangerous to bond the fence than not bond it.

However, I'm looking at the location in the photo... you said it would be TT, ... I therefore assume you'll be providing physical separation from the metal-clad building too, as that's almost certainly connected to exposed-conductive-parts of the PME system ?

Most of the above is covered in the iET Code of Practice for Electric Vehicle Charging Equipment Installation.