Hey UKMail people, don't rely too much on the timeslot and map (I know its easy for ME to say now that mine has arrived. But my day has seen it loaded onto the van at 8:02; NO movement from the driver till it shot to the 10th delivery at about 10:30, then at 11:30 it shot up to delivery 89 with me being 91!! I was very hopeful, but it remained that way for four hours

My iPhone *actually* arrived 45 minutes before my 16:47 - 17:47 slot!
Checking the map until about 17:30 it still said he was delivering the 89th delivery...?!
I actually got the "Your Next" text about 25 mins ago?!
Don't rely on the delivery schedule too much. - and Good Luck!