I have been looking for the new article that I read earlier...but can't now find it...but I have looked at some other source Reuters & New Vision...and they both say that the UK and Brussels have jointly agreed to reconvene negotiations on the 25th of September to allow for more flexibility...and that reasoning behind this is due to the UK political calendar.
It does not say that the PM asked for the tlks to be postponed.
http://www.newvision.co.ug/new_visio...oned-september
I can't see a week making much difference to the inflexibility of the EU negotiating team...in fact I can't see a week make much difference to anything, it has been as slow as a Godshorse.