Silent Witness

Nikki is called in when a private jet crashes in a forest outside London, and finds herself forced to be the bearer of bad news when she learns that the casualties include a former US ambassador who is also an old friend of Matt's. Meanwhile, Thomas investigates the suspicious suicide of a successful businessman, and uncovers an unexpected connection to the plane crash - which suggests the two cases are linked, and that the plane may have been deliberately sabotaged as part of a coordinated attack.