All the answer myself. Sorry for the question.
In British English Received Pronunciation, voiceless plosives /t/d/k/ are: Fully aspirated when followed by a

• vowel in a stressed syllable; Weakly aspirated when in unstressed syllable
• or word boundary (as every /t/ in the example sentence, except for the last one); and not aspirated when preceded by an
• /s/ or in final position (as, obviously, the last

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