From Tardis Wiki, the free Doctor Who reference

The UNIT HQ located in the City of London had a helipad. (TV: The Star Beast [+]Loading...{"timestamp":"00:49:15","1":"The Star Beast (TV story)"}) The Doctor's TARDIS was taken to the helipad when a helicopter brough the Fourteenth Doctor and Donna Noble to the HQ during the Giggle. (TV: The Giggle [+]Loading...["The Giggle (TV story)"])