Hi All
I found the best way to change that seal is to pull the speedo drive housing off and then tap the seal out from the inside of that housing.
Rover was using leather seals, that do weep, but spread the wear over a longer portion of the output flange seal surface. Most repairers now use the neoprene seals, however these seal concentrate the wear in one position, causing a wear line around the seal surface of the flange, but they generally stay dry.
Before you pull that housing off, you can check the preload on the bearing of the output shaft and there is a good description in the workshop manuals showing how to do this.
If you or anyone else reading this here, hasn't access to a manual, lets us know with a posting here and I will get off my sorry! and try scan the appropriate pages for you to follow.

