1981 Jan 14 - 1991 Jan 30
Prime Ministerial Private Office files
PREM19/3533
Security (Telephone scramblers installed in private homes: security of the private homes of No. 10 Downing Street staff)
| Source: | TNA, PREM19 series |
|---|---|
| Release date: | 2052 Jan 1 |
| Classification: | |
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