1832 .
But seriously: In the early years of the 20th century. By the mid 1920s it was well established.
BBC Radio Foyle was created on 1979-09-11.
BBC Radio Sessions was created in 2007.
BBC Radio Manchester was created on 1970-09-10.
BBC Radio Ulster was created on 1975-01-01.
BBC Radio Norfolk was created on 1980-09-11.
BBC Radio Foyle was created on 1979-09-11.
BBC Radio Durham was created in 1968.
BBC Radio Sessions was created in 2007.
BBC Radio Orkney was created in 1977-05.
BBC Radio Bristol was created in 1970-09.
BBC Radio Shetland was created in 1977-05.
BBC Radio Manchester was created on 1970-09-10.
BBC Radio Cornwall was created on 1983-01-17.
BBC Radio Ulster was created on 1975-01-01.
BBC Radio Shropshire was created on 1985-04-23.
BBC Radio Berkshire was created on 1992-01-21.
BBC Radio nan Gàidheal was created in 1985.