I and others have received deliveries from DPD recently and frankly been blown away by the outstanding live tracking facility they offer.
The delivery van can be live tracked on a street map, the delivery time seems to be quite accurately predicted (on my experience anyway), it is updated regularly, you can see how many drops are due before yours will arrive, plus you can reschedule for another day quite late in the process if you find you need to make last minute change of plans.
This thread by @wbbuttercup http://community.giffgaff.com/t5/Social-Off-Topic/Very-Impressed-with-DPD/td-p/11023577 has various comments about DPD which generally reflect my experiences.
The service is called Predict: Follow My Parcel - here's a DPD web page link with a video covering the innovative features. Update - DPD now has an app to track deliveries
The biggest advantage here to phone buyers would be saving time i.e. narrow down - ultimately to a 15 min delivery window and with reassurance that things are on track.
I have no commercial link with DPD, just found their new tracking service to be exceptional. I know other delivery services offer live tracking but I have not seen anything half as good as this.
Obviously I am not party to gg's commercial deal with their existing carrier but if DPD can deliver a comparable priced service I thing gg customers would be very happy.
What do you think?
Update May 2015:
In 2014, MoneySavingExpert polled thousands of people to find the UK's best and worst delivery services. DPD was rated best. UKMail was rated one of the worse couriers with the following votes:
DPD (4034 votes)
Great 2668 votes (66%)
OK 856 votes (21%)
Poor 510 votes (13%)
UK Mail (1988 votes)
Great 529 votes (27%)
OK 896 votes (45%)
Poor 563 votes (28%)
Update December 2015
In December 2015, MoneySavingExpert polled again and as of 17.12.2015 DPD has improved their stats from last year slightly and UKMail has got worse.
Update, This idea, posted in DECEMBER 2013 still makes sense.
In January 2017 MSE polled again and nothing much has changed.