Possible Clues:

• Where you'd expect to find Partridge when resting in conference?
• Xmas partridge location
• Conference provider's bad repartee
• Lance dropped one off to meet Holly in the conference centre presumably
• See 3-Down
• It's mentioned 12 times in a Christmas carol
• Tricky repartee for one of them behind conferences
• Partridge's place, in song
• Landscape art re-established partially in present setting
• Partridge's yuletide home