A recent addition to the British List, there have been three records in Cornwall, the first off Penzance in November 2007, then possibly the same bird at Porthpean in December 2007 and again, at Mounts Bay in November 2008. The most recent is still present at time of writing at Carnsew Pool, Hayle from 19th November 2009. Click on links for reports and photos from this website:
http://www.cornwall-birding.co.uk/recent-sightings/tuesday-24th-november-2009-cornwall-bird-reports/
http://www.cornwall-birding.co.uk/latest-birding-news/recent-sightings-4/
http://www.cornwall-birding.co.uk/recent-sightings/pacific-diver-at-hayle-estuary-today/
http://www.cornwall-birding.co.uk/recent-sightings/monday-17th-november-2008-cornwall-bird-reports/
http://www.cornwall-birding.co.uk/recent-sightings/friday-23rd-november-2007-cornwall-bird-reports/
http://www.cornwall-birding.co.uk/recent-sightings/tuesday-25th-december-2007-cornwall-bird-reports/