I did my learn to lead with Wet and High Adventures in Devon, it was actually delivered by Lou from Vixon Climbing, she was really good and I had a great weekend.
Your profile doesn't say where you are but your climbs look like Dorset
"jezb1" of this parish does work in that area and does really good small group or 1/1 sessions at a sensible rate - no connection other than as a customer - http://www.jbmountainskills.co.uk
I don't think you need a specific course, but time with a good instructor can be invaluable. When I first started leading a few friends got together and we hired an instructor for the day and it was great.
Instructors that I've worked with that I'd highly recommend:
You could get in contact with Belinda Fuller @ Beclimbing.co.uk
She is a great instructor as well as a coach, she coaches some of the White Spider youth that all placed in the top ten in each of their age groups.
Plas Y Brenin should have something to meet your needs, loads of different courses on offer and in my experience great instructors and very reasonable prices.