Accuracy is all very well, jackdaw but 450,000 is still a large number. It would take a *lot* of miscounting, in multiple locations, or other, equally widespread, irregularities to make a 49/51 split challengeable.
Incidentally, who is empowered to request a recount? Would it mean all voting stations in the country have to start again or will suitably empowered representatives be at each station?
Footnote:
2015 ONS.gov update.
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The total number of UK parliamentary electors in 2015 was 44,722,000, a fall of 1.3% from 2014.
The total number of UK local government electors in 2015 was 46,204,700, a fall of 1.3% from 2014.
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Neither figure is appropriate for the referendum because the Parliamentary count includes ex-pats and excludes UK-resident foreign nationals, while the local government count excludes ex-pats and includes resident foreigners.
The decline in voter numbers is perplexing.