taking industrial action ?
Flippin 'eck, they should come and look at the managers where I work, supping tea and sitting in the office all day.
Industrial inaction, I would call it
No, seriously though. This article does not mean someone has inside information on a strike date having been set.
Anyone who knows the law would know that if the union meets tomorrow (Wednesday), it has to give a minimum 7 days' notice to Royal Mail of any strike date. The writer of the article has presumably just worked out that there could
be a one-day strike on or after Wednesday 20th of June, i.e. sometime next week