I've just googled and found a few sites with threads related to requiring 6 months on a passport, even within the EU.
Well not everything you find on the internet is right.
The 6 months is not absolutely wrong though, just incomplete and misleading.
Some EU countries require 6 months on the passport OR an EU national identity card valid at the date of entry. A British passport counts as a national identity card as we don't (yet) have a separate ID card. So it just needs to be valid.