I should like to add vs. I would like to add?

[Nathan Smith]

Would someone please teach me when to say, "I should like to add..."
or "I would like to add..."

Thank you so much.
Nathan

[Cate]

HI,
I should like to add: by this sentence you express that to add something is the right thing to do.
I would like to add: by this sentence you express a wish, and that to add something is an action that you like to do.

[Cerberus™]

Or, if you were very traditionally minded, you would always use "shall" and "should" for the first person in plain future and conditional; never "I would like". There would then be no sense of obligation in "I should". However, by far most native speakers use "will" and "would" for all persons now; but in classical literature, or in present-day conservative circles, the old usage can still be found.