One date mentioned is April 11th 2001. Andrew had four engagements that day in the US:
1. The Duke of York, Chairman of the Trustees, Outward Bound Trust, attended the Morning Meeting at Willauer School, Thompson Island, Boston, Massachusetts, United States of America.
2. His Royal Highness also attended a briefing on the Outward Bound and Boston Public Schools Choices programme in the Lewis Library, Willauer School,
3.and later visited students from the Choices programme participating in a Search and Rescue exercise at the Farm Site.
4,The Duke of York, Chairman of the Trustees, this afternoon departed Boston for New York upon the conclusion of His Royal Highness's Outward Bound Trust engagements. Captain Richard Dilworth was in attendance.
I don't know how far apart these places are but that is the CC for the 11th April, 2001 for Andrew.
April 16th the CC has nothing listed for Andrew.
July 4th he was in the UK where he again carried out 4 engagements:
1. His Royal Highness this morning visited St. Luke's Church of England Voluntary Aided Secondary School, Hyde Park Road, Southsea.
2. The Duke of York this afternoon opened "Action Stations", an interactive exhibition about the modern Royal Navy, at Portsmouth Historic Dockyard.
3. His Royal Highness afterwards attended a Lunch on board HMS KENT.
4. The Duke of York later visited Portsmouth Hospitals NHS Trust Magnetic Resonance Imaging/Computed Tomography Unit, Queen Alexandra Hospital, Portsmouth.
July 8th there is nothing in the CC.
That means that on 2 of the 4 dates mentioned in this article Andrew was undertaking official engagements and on at least one of those days he was in the UK.
If I can do that check in less than five minutes than so can the DM and anyone else who could be bothered.