I think mine would be:
• Spaced - Series 1 - Love every minute of it. 2 was great, but I love 1 more I think.
• The Day Today - might not always be the funniest thing ever and there are flat moments, but I'm not sure I could bare to not have it with me
• Father Ted Series 2 (because there's loads of it and that Christmas special)
Honorable mentions: Men Behaving Badly (series 4 is wonderful throughout), South Park (series 5 or 6), Arrested Development (only seen series 1 so far), I'm Alan Partridge (series 1 just edges it for me) and Black Books series 2.