Not quite double spacing?

[Jon Whitmore]

As I was going through the Thesis Formatting Manual, I was struck by
what seemed to be overly-large double-spacing on the example pages.
But investigating it further, it appears that the Manual is actually
double-spacing, but when I latex the thesis, it's actually doing
something like 1.3 spacing.

Is there a way to increase the spacing throughout? The ways I've found
on Google searches all seem to break the UCSD Latex code... and I
found some warning text in the class files talking about changing the
underlying code changes margins and makes life difficult. (I actually
attempted to change uct12.clo \def\doublespacevalue{1.67} just to see
what would happen, but it didn't appear to do anything).

I took screen shots of the same text from the manual and as the theme
double spaces it (which clearly shows a difference):

Latex:
http://jonathanwhitmore.com/wp-content/uploads/2011/05/latexspacing.png

Manual:
http://jonathanwhitmore.com/wp-content/uploads/2011/05/manualdouble.png

Any suggestions on what I need to do would be greatly appreciated!
Jonathan Whitmore