To combine the last two posts, how do people feel about visiting Greece? This is what the FCO says:
There is a general threat from terrorism and acts of political violence. Attacks could be indiscriminate, including in places frequented by foreigners ...
There have been several attacks involving explosives and automatic weapons against Greek institutions, shopping malls, media interests, diplomatic targets and the police ...
British nationals aren’t normally considered a specific target, but attacks could happen in places visited by foreigners.
The advice concludes with:
There is considered to be a heightened threat of terrorist attack globally against UK interests and British nationals, from groups or individuals motivated by the conflict in Iraq and Syria. You should be vigilant at this time.