article_snippet: At 10.30am on Thursday, two men sat in unmarked Mercedes cars parked on double yellow lines outside BBC boss Tony Hall's 18th Century townhouse, occasionally mounting patrols around the nearby streets.
article_snippet: At 4.40pm one of the cars, a saloon, pulled up outside the front door and the driver waved to the driver of the other car, an estate.
article_snippet: A Ford Transit Connect van marked London Protection Services Ltd drew up outside their house and two black-clad men sat outside the property overnight.
article_snippet: Lord Hall, dressed down in a green Barbour jacket, black jeans and walking boots, then emerged and drove a mud-spattered Jeep to her front door.
article_snippet: Barbour filled up the boot of the off-road vehicle, watched by the bodyguards, before Barbour joined Barbour and they drove off together.
article_snippet: Two security team members hired to protect Lord Hall and Barbour stand guard beside unmarked cars .