If you do a search for the first episode of Emmerdale, in part 2, there's a part where you can see Frazer Hines standing next to someone who's over 6 feet tall - or watch "The Two Doctors", and look at him next to Colin Baker, who I think is 6'1"? Patrick Troughton was only around 5'7" or 5'8" himself.

Son of Edit: Here you go: http://www.youtube.com/watch?v=Jxgcu6xWeK4#t=04m07s . :)