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It doesn't really show anything, as there's no context - if you remove the neutral at the sub-station, then it depends entirely on the respective loads on each phase - if the phases are well balanced (as it's designed to try and be) then the voltage should remain the same.
By adding you own 3 phase transformer, all you're doing is moving the issue - if you lose the neutral on the output of the transformer you've got exactly the same situation.
Except he's asking about UK single phase supplies to domestic premises - so only two incoming wires, neutral and live - if either is disconnected you get no power at all.
Industrial three phase is somewhat different, and can be connected as either star or delta - where delta has no neutral at all. But any three phase system should have little current through the neutral anyway, as it's supposed to balanced across all three phases as much as possible, hence thick live wires and only a thin neutral.
For a 10kW installation, supplied with three phase, how can we ensure that the Line-Neutral voltage does not rise up to the line-line voltage if there is a loss of neutral connection?
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