The UNIT HQ located in the City of London had a helipad. (TV: The Star Beast [+]Russell T Davies, adapted from Doctor Who and the Star Beast (Pat Mills and John Wagner), Doctor Who 60th Anniversary Specials (BBC One and Disney+, 2023). Timestamp 00:49:15.) 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. It also served as the location of the Fourteenth Doctor's bi-generation and the Game between the Toymaker and the Fourteenth and Fifteenth Doctors. (TV: The Giggle [+]Russell T Davies, Doctor Who 60th Anniversary Specials (BBC One and Disney+, 2023).)
In battle mode, the helipad lowered down a few levels to serve as a weapons platform for the galvanic beam. (TV: The Reality War [+]Russell T Davies, Doctor Who series 15 (BBC One and Disney+, 2025).)