We have a trip to Harry Potter studios and London planned over Easter. Originally we were traveling down by train and staying near the shard.
Due to train strikes and engine work we are now staying in Watford, and will drive. We want to travel into London by train/tube on two days, and possibly get a bus or two to go past a couple of sights.
I've looked at TFL and completely confused. Dc are 10&12 so I can get an oyster card for 10 year old but not 12 year old? There's also mention of travelcards and day passes I think. Some they recommend you sort before arriving. Anyone have any suggestions on the best option.