Royal Mail

Royal Mail was the name of a British postal company. (TV: Day One)

On 24 December 2006, the TARDIS narrowly missed crashing in to one of the company's vans. (TV: The Christmas Invasion)

A postman was nearly murdered by the Sex Gas in the host body of Carys Fletcher. (TV: Day One)

Another postman heard Owen Harper being shouted at by Ed Morgan. (TV: Ghost Machine)

In 2009, a Royal Mail card was stolen by the staff of Torchwood Three. (TV: Children of Earth: Day Three)

In 2009, one of the storage bags was seen on the Thames House helipad. (TV: Children of Earth: Day Five)

One of their employees was murdered in a Dream Lord reality. (TV: Amy's Choice)

The Royal Mail still existed in 2050. (TV: The Last Oak Tree)

Behind the scenes
In 2013, to celebrate Doctor Who's 50th anniversary, Royal Mail published the Doctor Who 50th Anniversary Royal Mail Prestige Stamp Book, a stamp book which included the Eleventh Doctor comic story Doctor Who and the Last Stand.