these are my thoughts, tackled section by section
Delivery spans
I like the idea of the 2x3 hrs. coming back to the office in between and having a sensible place to have your break makes sense. 6 solid hours in the sun, rain, freezing cold with nowhere to shelter for you break is only going to lead to an increase in sickness.
Yes-coming back soaked and sitting it wet clothes and going out again to get soaked again? unless you always bring a change with you?
Problem is if these machines rob our indoor workload what are we going to do for work? We can only do more outdoor!
Royal mail are adamant that trials have gone well but I can see this one wave arrival not working and major problems with it.
And 10-6am worktimes are a disastrous change to peoples lives.