The transition to all-figure dialling allowed the codes to be grouped into eight sectors; all exchanges within of the centre of London formed the Central sector and the other sectors radiated from it.
All exchanges within of the centre of London formed the Central sector and the other sectors radiated from it. The transition to all-figure dialling allowed the codes to be grouped into eight sectors.
The transition to all-figure dialling allowed the codes to be grouped into eight sectors. All exchanges within of the centre of London formed the Central sector and the other sectors radiated from it.
The transition to all-figure dialling allowed the codes to be grouped into eight sectors. All exchanges within of the centre of London formed the Central sector and the other sectors radiated from it.