A huge mixture of things that I boiled down into component parts:
- THree OGUN synths for the basses
- Two POIZONE synths for the wonderful We Wah Wee that we all know
- A DX10 for the //nearly silent// cymbals
- A small collection of my favorite sound clips from the series (mostly the older doctors).

Tools used:
MPC (to make sure I had my MIDIs right)
PoZone+OGUN+FL Studio (To make sure I was making pretty noises)
Audacity (Well, that was to downmix some of the sounds)

** I DIDNT DO THE MIDI! **
I found it on the Dr. Who Sound Archive (MIDI Archive)