Family carol concerts and church services in London - recommendations?

[cleanandclothed]

This will be our first London Christmas with DS (3). I would love to take him to some carol concerts and advent/christmas church services - any suggestions? Central or South East London (Southwark) suits us best. Preferably something not mega-expensive or that involves queuing for ages. We will probably go to our local church for their 9 lessons and carols, and was wondering about the Christmas Crib service on Christmas Eve in Southwark cathedral. Does it get very busy? Any other suggestions?

[LondonMumsie]

There was something on here earlier about Westminster Abbey and the person who had gone said they walked straight in.

Christingle services are always child-friendly, you can search for one by postcode here:
www.childrenssociety.org.uk/in-your-area