> 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 cou

> 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.