I found this book whilst rummaging around at National Archives today. This is just a short note to tell you that it exists. Because it still might be sensitive information, I'm not giving you its location but I'm sure if you are determined to look, you will find it.
Inside is the explanation: Following the 1956 uprising in Hungary the New Zealand government agreed to accept 1000 refugees which increased to 1300. BCAP 1529 49/a