I sent my docs directly to ADVO through Aramex on 5th May. Aramex confirmed that it was delivered on 6th May. I will keep checking on Aramex website using the return airway bill to see if ADVO have dispatched it. I guess it won't be done before first week of June. 4 weeks TAT seems like a really long time in comparison to the PPR processing time (less than 2 months in my case).