Where can I find UK Album charts from say, '70-'73?

Try this: http://www.everyhit.com/. The UK Chart Archive.

Everyhit only has annual album charts, though. I don't know of an archive, printed or electronic, of weekly UK album charts. You might have to visit a library that holds old Music Weeks or whatever was printing the official charts in that period.

No, that's okay. This is a start. Thanks people.