Posted on the U.K Government site:
Safety and Security – Local Travel and Major Pre-Planned Strikes:
Possible disruption to power supplies until 30 June due to industrial action. More information is available on www.dei.gr and from the telephone information line: 0030 210 9298100.
Industrial action by dock workers planned for 24 June has been cancelled.
A 48 hour general strike on 28 and 29 June has been announced. All port services likely to be affected, including ferry services throughout Greece. Passengers are advised to contact the company they are travelling with for further information.