used when mentioning the last person or thing of a group, in order to say that they are not less important than the others :
Last but not least, I'd like to thank all the catering staff.
used when mentioning the last person or thing of a group, in order to say that they are not less important than the others :
Last but not least, I'd like to thank all the catering staff.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005