The David Tennant Treat 4 Today is from the 2007 BBC drama Recovery.
Recovery deals with the life of Alan Hamilton (played by David Tennant), the former head of a construction firm, after he receives serious personality-changing brain injuries in a road accident, and the emotional feeling of his family.
Tricia, his wife (played by Sarah Parish) struggles because the man she knew has gone. Throughout the programme she tries to bring him back through memories, photographs, her sons and herself.
It was while David Tennant was filming Recovery that he became involved with the charity Headway Essex.
Recovery was only shown once on BBC One and there are no plans to release it on a DVD but someone has kindly added it to YouTube. This is the second part of the drama.
Apologies if this video does not play in your country.