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by graemep 541 days ago
> I couldn't find a time between 1980 and now where part of 1831 was a London number.

What about when outer London numbers started 081? Dialed from another country with the 00 international call prefix the number if could be a fragment starting from the second digit (i.e. 0044 1831xxxx)?

the change form 01 was a big deal, and BT ran some very amusing ads playing on snobbishness about where in London one lived.