I hadn't heard of the ones in London. Glad to see the trend is spreading. I researched carols in Wiltshire and Somerset to find some local to us and I found a wonderful book called 'Carols of the Westcountry' by Glyn Court. Perhaps you could research carols from London and the home counties. I think I may have come across some from Kent.

Anyway today's the day we start our new group to learn the harmonies of Bradford on Avon carols.