Post Office managers will stage their first industrial action in 34 years in a dispute over pay.
The Unite union, which represents 900 managers, said its members will ban overtime and work to rule for 24 hours.
The union accused the Post Office of "dragging its feet" for 16 months over a pay deal and warned of further industrial action if the dispute is not resolved.
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Police said the child, who was without a driving licence, was trying to make his way 2,500 miles from the east coast to Perth.
The 24-year-old was charged with 14 counts of wounding with intent to do grievous bodily harm and one count of throwing a corrosive fluid.
Winds will veer northerly overnight with colder air streaming in over the next few days.