To my ears, the Cambridge dictionary pronounces the word "Mid" /mɪd/ really like /mi:d/ for British accent. So the long /i:/ is being used instead of the short /ɪ/. Compare:
- https://dictionary.cambridge.org/dictionary/english/mid
- https://dictionary.cambridge.org/dictionary/english/meet
Did I hear it wrong or is it the pronunciation is not correct?