I have been asked to reply.
The information requested falls within the responsibility of the UK Statistics Authority. I have asked the authority to reply.
Letter from Stephen Penneck, dated January 2010:
As Director General for the Office for National Statistics, I have been asked to reply to your recent Parliamentary Question concerning the level of long-term (a) adult and (b) youth employment in Preston in each year since 1997. (311073)
Long-term employment is not a concept for which the Office for National Statistics produces statistics.