PARALLETTES HERE http://www.incitefitness.co.uk/pullupbars/metal-paralettes
http://www.incitefitness.co.uk/pullupbars/ for fitness equipment
http://www.incitefitness.co.uk/pullupbarbuilds/ for bar builds
This is a bit of an evolution of the muscle up; starting from beginner form and working up to a clean muscle up.
Hopefully this will help you improve your form. Find the MU that matches your current form and then try the next one up.