This is remind that M14 will be ship with M52 by first July as per your requested. Therefore, please issue the LC for M14 at the same time.
This is a reminder that M14 will be shipped with M52 by July 1st as per your request. (The second sentence is fine.) (I am from the US so we do the dates differently than in British English. You could instead say "...by the first of July as per..."