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The information requested falls within the responsibility of the UK Statistics Authority. I have asked the authority to reply.
Letter from Stephen Penneck, dated December 2011
As Director General for the Office for National Statistics, I have been asked to reply to your recent Parliamentary Question, pursuant to the Answer of
The Office for National Statistics produces estimates of long-term international migration, primarily based on the International Passenger Survey (IPS). The IPS is a continuous voluntary sample survey conducted by the Office for National Statistics.
The answer of