Haven't read full thread, but majority of posties here aren't striking over money but over the way the company is going.
Royal Mail want to significantly piss over working conditions- sick pay, absence process, working times/hours. These will screw up many posties's lives and where families have built around these (e.g I'm a teacher so no way I can collect my children at end of day from their school, but it's okay because dh can) that causes big problems. Either additional childcare costs we haven't budgeted for, or more likely as childcare provision here is shit, I have to beg to work reduced hours if head can cover it, or dh has to find a new job after 25 years with RM. Working hours and start/end times to change depending on time of year. Another of his colleagues has additional caring duties after work - not if RM have their way. People who accept shift work with these kind of conditions know what they are taking on and build lives around it, taking that into account, but posties are having their family lives pulled out from under their feet.
Posties can see RM is going all out to rival DPD with delivery of parcels only and to where needed only. Public complaining about hospital letters, Christmas cards etc should also see that this is a direct result of RM policy. You see it now, as it's Special deliveries and parcels being prioritised. Posties on the ground are being told by managers to take parcels and Specials, and then whatever else they can. But we've all seen the photos of stacked up mail centres - so this results in mostly being ONLY specials and parcels. And RM don't care (despite spokespeople saying "all mail is equal") as they want to kill off a letter service and blame posties - they are determined to be strike busters. So letters are going to go the way of the dinosaurs if RM get their way. They've already tried to get out of having to do 6 days of letter delivery every week, if that had gone through you can bet it would have dropped to 4, then 3 etc until it was a distant memory, like second collections and deliveries.
Cynical me also looks at the billionaire lurking in the corner waiting to buy it, wondering how much he's paying top RM people to let the shares and value of the company nose-dive in order to get a cheaper price. But tbf, I have no justification for thinking that.