I try and go to one every year. This year I went to my local evangelical Church in Muswell Hill. Massively, massively impressive building. The carol selection was good with lots of traditional favourites. Of personal favourites, they had Silent Night and O Little Town of Bethlehem but no In the Bleak Midwinter.
The production/arrangement was the best I've seen in three years I've started doing this with a string section, a choir, two sopranos (enjoyed those less tbh but it was quite impressive) and even some gospel singers thrown in. The vicar was good though not as good as others I've seen.
Carol selection - 8/10
Vicar/service - 7/10
Music and arrangement - 9.5/10
Building and architecture - 8.5/10