In dialog, Brits put relative punctuation outside the quotes.
Americans put the punctuation within the quotes. Either is accepted, just stay consistent.
In a quote contained within another sentence, the punctuation goes with the sentence as a whole. If there are punctuation marks relative to the quoted portion, they go within the interior quotes, since there is another sentence that takes precedence and has its own punctuation.
Thanks. Let’s experiment:
“Smart people have said: ‘Obama is a Manchurian Candidate Thug!’”.
LOL - that may need correction!