<p><pre><code>  Martin: Yes, [the Napolean prize] is a NATO award given once every
          five years: gold medal, big ceremony in Brussels, £100 000. The
          PM&#x27;s the front runner this time. It&#x27;s for the statesman who&#x27;s
          made the biggest contribution to European unity.
  Sir Humphrey: Since Napoleon. That is if you don&#x27;t count Hitler.
</code></pre>
It&#x27;s a joke, but has some truth to it: there isn&#x27;t a single homogeneous society, but each country did become much more homogeneous in the post-war, after millions were &quot;returned&quot; (often against their will) to their countries of origin. And social democracy was and is the de-facto model in most countries, even if occasionally threatened.