[Graham]

Having tried my best to get an answer from DPD Customer services Chat line,
It seems they do not deliver on a weekend, so the Round 2 will be postponed until further notice and we will look to have the cars collected next week, assuming that they arrive eventually early next week 

Interestingly, DPD have just made a delivery to one of my neighbours. As today is Sunday, the do some deliveries around here at weekends. I do not live in a heavily populated area, in fact I'm almost at the Peak District National Park.
Who knows, the cars could still arrive.

Yes I have also seen the DPD delivery van locally delivering on a weekend too, but the customer service agent was quite emphatic that they do not deliver on a weekend.......make of that what you wish