Why can’t I deliver directly to a parcelshop in UK or organize parcelshop returns anymore?

Unfortunately we cannot offer this services anymore. If the recipient is a Pickup Parcel Shop, the shop is considered to be the importer of the parcel and this is not possible. What you can propose (if the parcel already passed customs) is that the recipient in the UK changes his home delivery to a Pickup parcelshop delivery via the Predict notification he will receive from DPD UK.