Give the posties a break - as a pp said, posties now have to sort their own post before they start their round (as all the people who used to do this job have been 'let go' in the name of efficiency (?!?!) and financial constraints).
After they have delivered their own round, they may have to go back to the office to sort and then deliver someone else's round, as there are no 'relief' staff any more, so if someone is off sick/on leave their letters and parcels have to be delivered as a 'second' post by someone who has already done their own round...!
Like all other organisations being 'slimmed down' for privatisation, lots of staff were made redundant - with no real thought about how this would impact on the service - simply to save money and make it more attractive to investors. There was just the assumption that the remaining staff would 'pick up the slack' - i.e.do twice the work for the same pay...
Can you tell that I know a postie..?? 