1979 Jun 21 - 1994 Mar 15
Prime Ministerial Private Office files
PREM19/4624
Downing Street (Use of RACAL speech privacy equipment during PM trips abroad: secure communications between No.10 and PM on regional tours; direct fax links between Whitehall and No 10; use of secure telegram systems with PM's aircraft)
| Source: | TNA, PREM19 series |
|---|---|
| Release date: | 2018 Dec 28 |
| Classification: | |
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