Jeff
Glad you found the info helpful !

Larry
Try this page for starters:
http://www.gbstamps.com/gbcc/gbcc_rates1.htmlYou will find domestic rates 1966-2006 including a page for PiP {Pricing in Proportion}. The latter should be a venture in itself.....so see you next year when you learned it !

International rates are only after 2000 except USA which is 1968-2000.
Off you go then, study.
Londonbus1.....remember PiP, PiP, PiP, PiP