[I may note that having listening devices placed in rocks was widely used by the UK in Northern Ireland for many years-ed]

Russian state television has broadcast video footage of what it claims are British diplomats spying in Moscow.

In the programme, people claiming to be Russian intelligence officers say British agents planted a transmitter in an imitation rock on a Moscow street.

The officers say British embassy officials then walked past downloading data from the “rock’s” transmitter.

The UK Foreign Office said it was “concerned and surprised” at the claims and denied any improper conduct.

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