We visited St Paul's with our 3 and 5 year old children. The children loved the climb up to the Whispering Gallery but other than that they wasn't a great deal to keep them interested which is not a surprise as obviously we were visiting a place of worship not a playground. St Paul's website is very useful and has learning resources that we used once we returned home. Audio guides were included in the entrance fee so you can move around the Cathedral at your own place. The cafe and restaurant were first class. We visited One New Change that is across the road that has great views from the 6th floor which is worth a visit. St Paul's is an amazing place to visit but I feel that £14 per ticket is a bit steep.