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PME earthing to a group of static caravans TT earth required?

LittlePlumb
Can anyone give me there valuable opinions on earthing to a static-mobile home please. As per BS7671, PME earthing is not allowed to (mobile) caravans. However, does a static caravan (plumbed in and permanent with a SWA cable supplying it and no plug/socket arrangement) count as a caravan. The Static caravan is metal framed, and placed some distance from the PME source 40m or so, and the cable size is 16mm CSA 3 core, so PME (100A single phase) could be exported on the cable as its greater than 10mm CSA,

The static caravan is permanent and not quite the same as a transportable caravan, so does a TT earth need to be installed?
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    The SWA armour can stay as the PME earth, so that if anyone digs it up, it trips ADS with a convincing bang, The caravans unless very old, will have RCD protection on the incomer any way, so the only need is to insulate the PME earth at the van end, and add a local earth, which assuming you can get a rod in, should be reasonably straight forward. Could even be done in an adaptable box on the outside of the van, perhaps underneath,  if there is no appetite to disturb the internal decor.

    For the opposite slant, on just how bad it can actually get, try reading this  old thread .
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    The SWA armour can stay as the PME earth, so that if anyone digs it up, it trips ADS with a convincing bang, The caravans unless very old, will have RCD protection on the incomer any way, so the only need is to insulate the PME earth at the van end, and add a local earth, which assuming you can get a rod in, should be reasonably straight forward. Could even be done in an adaptable box on the outside of the van, perhaps underneath,  if there is no appetite to disturb the internal decor.

    For the opposite slant, on just how bad it can actually get, try reading this  old thread .
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