Extras for this set have been cleared at the BBFC:

Extras for Happiness Patrol:
00:23:44:08 HAPPINESS WILL PREVAIL
00:05:46:01 THE HAPPINES PATROL - PHOTO GALLRY
00:23:18:03 (DOCTOR WHO - THE HAPPINESS PATROL - DELETED & EXTENDED SCENES)
00:46:03:04 WHEN WORLDS COLLIDE

and for Dragonfire:
00:35:04:23 FIRE AND ICE - THE MAKING OF DRAGONFIRE
00:15:40:14 THE DOCTOR'S STRANGE LOVE - DRAGONFIRE
00:12:31:19 THE BIG BANG THEORY
00:04:46:06 DRAGONFIRE PHOTO GALLERY
00:09:55:15 DOCTOR WHO - DRAGONFIRE - DELETED & EXTENDED SCENES