Steve Gardham, Liz and I played at a Christmas Fair on Saturday. We did all of the stuff you would expect our generation to know. The very small children waiting to see Santa were fascinated by the instruments (most people never see a real musical instrument being played) and even joined in at times. There was a genuine atmosphere of appreciation. So, no, even in a very secular situation, traditional carols fitted and were seen by the general public to fit. Its a bit like that, 'no man is an atheist on his deathbed' quote; no one is truly secular at Christmas.