I think it's unlikely there'll be any real co-ordinated action by the unions - at the very, very most a single 24-hour strike. Unison, the CWU, Unite - all their leadership have very close relationships with the Labour Party and will go out of their way to avoid too much embarrassment for Brown.
People are very, very pissed off though and it's more likely than it has been in the UK at any point in the past ten years or so I reckon. There's still a chance (although increasingly small unless there's a revolt by the CWU membership) that we'll see significant strikes in the post office, the civil service (PCS union) has been increasingly militant the past few years as well.
It is more than about just pay - postal service is facing major, major casualisation - 20-ish "strings" attached to the pay (cut) offer that would see the job changed beyond recognition.




Saw this BBC report. Is this more bark than bite? Is there more to it than simply wages?
"Unions back 'co-ordinated' action
Unions are warning of a 'winter of discontent' over pay
Unions have voted to take "co-ordinated industrial action" against the government over its below-inflation pay settlement for public sector workers."
http://news.bbc.co.uk/1/hi/uk_politics