I think it's Parceline.
Or is it DPD
Had my n95 8gb delivered today from 3,it was delivered by royal mail next day special delivery.
They actually have a new system in place:
Upon ordering the day before, 3 customer services told me DPD will get in touch to confirm the delivery date.
1 day before expected delivery i.e. today, I received a text from 3/DPD asking when I'd like delivery. Text 1 for 1st May, 2 for 2nd may, 3 for 6th may.
I texted "3" back.
Received confirmation within hours saying it's confirmed for 6th May.
Hope it comes as scheduled.