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I got a quote for 3 phase upgrade some years back, the cost for which I wouldn't describe as nominal.

It involved no trenching, but did include several poles, a lot of expensive cable and a new transformer. I imagine the cost would now be a quite significant five figure sum as nothing has changed with local distribution.
 
Sounds like you haven't been involved in organising supplies to buildings before, there will likely be a very large difference In single and three phase.
Well lets say you are building a housing estate. Developer will arrange for DNO to lay 3-phase in the pavement on each side of the road. That is the expensive part.

Each house then needs a feed and here you have a choice of single or 1 or 3 phase cable / cut our, and that's the bit with nominal material cost difference and almost zero labour difference.
 

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