We took a train into the city, hopped on the tube and then walked up Regent's Street to the oldest toy shop in the world. Hamley's is unbelievably huge and is full of demonstrations, interactive toys and staff who are trained to be engaging and friendly. There are seven floors, and I had promised the kids I'd buy them sweets on the top floor. Gradually we made our way up and the kids were entertained all throughout.
I bought root beer for the kids and then we walked back to Charing Cross and took a relaxing train ride home.