Seems eminently sensible for many industrial supplies - a huge part of the cost is the labour, so put in a 3 phase supply (which isn't 3x the amount of copper of course) but only connect up one phase if the current user doesn't want 3 phase. Upgrade to 3 phase is then simple and doesn't involve destroying the property, digging up the floor/yard/street etc. I've even seen it done in new office units.
I may be worthwhile considering uprating to 3 phase as it will give a wider choice of equipment to connect
Except that I assume a 3 phase supply will cost a bit more. It may be worth asking, though of course your distribution board will probably go up in cost as well, and the savings/benefits in being able to use 3 phase equipment may not justify it.
It looks like that the supply is a TNCS/PME type of supply, with the earthing conductor rising straight out of the right hand side of the Neutral connection block beside the right hand fuseholder.
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