During my time at GL Jones Playgrounds Ltd, I helped develop the D004 AbilityWhirl Self Propelled Roundabout. The D004 features gates that wheelchair users can use by themselves without the aid from a helper. There are two large areas for wheelchairs to be place on the roundabout and large seating areas for up to 6 other children. 

You can see more of the D004 on the GL Jones Playgrounds Ltd Website: http://www.gljones-playgrounds.co.uk/

Thanks! 

Nathan =D

(Photo Credit for GL Jones Playgrounds Ltd)