Won appeal but when will I hear from DWP about pay

Hi all, my sons change from DLA to PIP was refused but after a long stressful battle and lots of help from Benefits and Work we finally won his appeal - Enhanced rate mobility and standard rate care instead of High care and low mobility on DLA. We had the letter from the tribunal a few weeks ago now (letter dated 9/4/15) but we still haven't heard from DWP. Does anyone have any idea how long it takes them to contact us and start paying my son again?

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It can take around 8 weeks for DWP to commence payment, you can sometimes speed up the process by sending in a copy of the tribunal decision.