https://www.bbc.co.uk/news/business-66644709 
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All the BBC's early broadcasts were on mediumwave. On its formation in November 1922 the BBC inherited three MW transmitters (2LO London, 2ZY Manchester, 5IT Birmingham) from its founding companies.
The 2MT Writtle experiments were IIRC at 428 KHz which was either on Longwave, Mediumwave or inbetween depending on which point one considers LW to end and MW to start.
Nowadays 279 KHz is regarded as the top end of longwave but in times past it ran up to 433 KHz
IIRC in the early days of the Daventry LW transmitter Writtle was retained as backup/standby.
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BBC Long Wave - Tom Thumb 10/7/2023, 15:48:40
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