I remember Freddie whizzing Kirsty and Eloise round on the swing/roundabout in Hampstead Heath Playground when they were around 8 - 10 years old.  They were having so much fun, going very high and very fast and squealing with excitement and exhilaration  - pushing that play equipment right to its limits.  There were lots of other envious children looking on and wanting a go, and before we knew it there was a queue of children and adults lining up to take a turn on 'Freddie's Roundabout' ride.