Police will be putting a ring of steel around Windsor for Prince Philip s funeral this weekend.
Specialist officers and sniffer dogs have been searching phone boxes, post boxes, drains and bins as part of the operation.
Thames Valley Police said it has put a range of visible and covert security measures in place for Saturday, when the duke is to be honoured with a ceremonial royal funeral at St George s Chapel.
These include automated number plate checks, CCTV and barriers to prevent attacks using vehicles, as well as armed and mounted officers on patrol.
And experts say GCHQ could even be listening in to chatter around the world online and on phones, looking out for any spikes in conversations about the funeral.
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