TV comedy-drama series starring James Nesbitt, Helen Baxendale, John Thomson and Fay Ripley (4,4)
I believe the answer is:
cold feet
(Other definitions for cold feet that I've seen before include "Icy extremities for slang fear" , "Loss of courage or confidence" , "You'd have them if you were afraid to proceed" , "Chilly extremities due to fear" , "You might have them if you're afraid to proceed" .)