Also in London, the cards were very useful: As soon as we had arrived at a place of interest, I dug out the corresponding cards, the attraction compared with the colorful and detailed drawings on it and read me the cards through. Also "Did you know" (as could find one example that the lions in Trafalgar Square from cannonballs were built, or that was sold before a baby elephant in Harrods) and "near" (As you can find out what the London attractions are nearby) I found very useful.
Also, the respective metro stations have been specified on the card, liked me and my family very much and helped us with orientation in London.
The card form I find this extremely handy again I have the cards sorted from "because we were" before "because I still want to go", or just after the alphabet, or the metro station.
All in all: A great product that I would recommend to anyone who wants to go to London with kids (or without?) Very much !!!