I can confirm that I am using Select All / Ctrl-A before updating the issue date and it doesn't seem to make a difference, as per the attached.
Re Point D, the 7 & 12 weeks should count from the preceeding Monday.
Regarding the actual text, it says something along the lines of... Between Monday dd/mmm/yyyy - Friday dd/mmm/yyyy parties are to return document outlining dates of availablity between dd/mmm/yyyy and dd/mmm/yyyy which is the target date (this date is manually entered, as it is not fixed.)
Hope this helps.
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