Christmas in the UK

We have been to the UK at least 2o times in the last 30 years, and yet, we have never spent Christmas in there. So this year we decided to be with family and friends in England and are quite excited to be doing so. We want to spend a typical English Christmas and we perceive this to mean English church services and carols at St Pauls and Trafalgar square. We also want to see the lights at Oxford and Regent streets. I read somewhere that the theme this year is Dickens so I want to see where that leads us