Also, why is the Master in that stupid disguise? Storywise and characterwise there's no reason - it's just to give a rubber-ripping cliffhanger. Daft.
And they don't even attempt to explain it, either. Its as if the Master has become a master of disguise for, well, the hell of it.
Furthermore, its a sad excuse of a serial to follow-up directly from Earthshock. I know they didn't do emotion of proper characterization back in the 80's Who, but I would like to think that Time-Flight is not exactly the best seasons finale they could've come up with.
In fact, I don't think I like it almost at all - OK, I like all Heathrow scenes, I guess, and surely the first TARDIS scene, and Tegan's "accidental" exit, but otherwise... a rather boring, nonsensical affair.