OK, it turns out that the second drive had once been part of a RAID as was not
being recognised. Using:
sudo dmraid -E -r /dev/sda
as described on this page:
http://ubuntuforums.org/showthread.php?t=2003675
fixed it.
** Changed in: ubiquity (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1330172
Title:
Unallocated space on one of two drives not offered for installation
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