Quote:A check of the Ofcom site shows that these numbers beginning 0 (following STD code) are being introduced.
NDO numbers have been around for decades.
Wikipedia has a list showing the migration of London 0171 and 0181 NDO numbers to new 020 ranges in 1999 in their Big Number Change article.
Quote:Perhaps BT's system sees 0200 200 and allows it as the local number starts with 2...
The local number starts with a 0. The number is 020 0200 xxxx.
By definition, NDO numbers always start with a 0 or a 1.