Are you sure? I thought T.Bag's Christmas Carol was made just before Pearls of Wisdom. Sally looks a lot older than she was in Revenge - just like she did in Pearls - and - sadness showing - the font used on the end credits is the later one used for all the Georgina Hale episodes. Also, virtually the same street set is used in Episode 3 of Pearls ... and Episode 7 of Rings!
Almost certainly was John Plant, Charles Warren and Leon Thau.