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Number ranges starting 01 can have National Significant Number (NSN) length of 10 or (very rarely) 9 digits. NSN is the number of digits after the leading 0 trunk code or +44 international prefix. The 0800 range can have NSN length as 10, 9, or 7 digits. The 0845 range can have NSN length as 10 or 7 digits.
Some surgeries have two telephone numbers: one a premium rate 0844 number with a higher level of service and the other a standard geographic 01 or 02 number with a lower level of service, [227] [228] thereby creating a two-tier system for accessing the NHS services. [229]
0800 was Tongue (TO0) – numbers were transferred to 0847 (ELNS) [notes 14] 0800 later used for BT Freefone numbers - usage of BT 9-digit 0800 numbers continued after the Big Number Change; all new 0800 allocations have 10 digits and multiple operators now issue 0800 numbers. 01801 — unused
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The National Grid is the high-voltage electric power transmission network supporting the UK's electricity market, connecting power stations and major substations, and ensuring that electricity generated anywhere on the grid can be used to satisfy demand elsewhere. The network serves the majority of Great Britain and some of the surrounding islands.
The 1926 Act created the Central Electricity Board, which set up the UK's first synchronised, nationwide AC grid, running at 132 kV, 50 Hz. The grid was created with 4,000 miles of cables: mostly overhead cables, linking the 122 most efficient power stations.
The National Energy System Operator (NESO) is the nationalised energy system operator for the United Kingdom. Previously owned by National Grid plc , when it was known as National Grid ESO, it is a public corporation which operates both the electricity and gas distribution systems from 1 October 2024.
The first high-voltage substations in Britain were built as part of the National Grid in 1927–1933 by the Central Electricity Board under the provisions of the Electricity (Supply) Act 1926. The substations and the grid operated at 132 kV and provided local and regional inter-connections. [ 1 ]