Festive things to do in London with toddler

[amidsummernightsdream]

Planning to visit my brother who has recently moved to London with our 18 month old dd in early December.
Visited London before but not with a toddler and not near christmas.
Would like some ideas of festive ideas to do to get into the christmas spirit that will work with a toddler.
We’ll only have a day to wander round, so would be good to make the most of it

There’s a fake snowfall in Covent Garden every hour on the hour from 12:00 - 7:00. It lasts for a good few minutes and my dd loved it last year!
In Hyde Park Winter Wonderland there are a few rides for little ones including a Santa train, helter skelter and the Christmas tree ride, but my dd just loved the lights and watching people ice skating. There’s also a traditional carousel at the Southbank Bavarian Christmas market.

These all sound fantastic, exactly the kind of things I was looking for- thank you!

Department store Christmas windows on Oxford Street. Selfridges is usually good. Then at Oxford Circus turn into Regent Street and see Liberty and Hamley's.