I have the Haynes manual and its great. I have not seen the Triumph Service Manual so I cannot compare one to the other. From what I have read and heard save the bucks and buy the Haynes.

You may say I'm a dreamer but I'm not the only one John Lennon Imagine Anyone who stops learning is old, whether at twenty or eighty, anyone who keeps learning stays young, the greatest thing in life is to keep your mind young. Henry Ford