We visited Kensington Palace one afternoon. We were short on time so we didn't get to visit the gift shop and as much as we liked. Kensington is very impressive and was quite known for the time Princess Diana spent there.
All around London are walk plaques in the sidewalk which is to follow the footsteps of Princess Diana. They are within Kensington too. It was here that a special playground was built in the memory of the Princess as she cared very much for children.