Re the point about Royal Mail. After 2010 postage prices rose quite significantly. There were increases in postal prices in 2012, 2013 and 2014 and at the end of March this year the price of a first and second class stamps rose again to 63p and 54p respectively.
On the news a couple of nights ago it was suggested that Royal Mail is increasingly looking as if it will be unable to honour its obligation to make deliveries to every address in the UK, even those off the beaten track, at a flat rate price.
In 2011 a Daily Mail article warned of possible problems if the Royal Mail was sold:
"Holland was the world's postal privatisation trailblazer, transforming its state-owned postal service to a private corporation in 1989."
"..........Privatisation in Holland has also led to the closure of around 90 per cent of the country's post offices ....... In the space of just one month in 2009, ten per cent of all Holland's post offices closed."
" .......Complaints about the reliability of Holland's privatised post are widespread."
".......The move was supposed to increase competition and lead to better services. But the opposite has occurred. New firms paying workers below the minimum wage have hit deep into the profits of TNT."
So if you're looking for a better value, more efficient service it seems that privatisation will not necessarily provide it.