I trained through the “British Wheel Of Yoga” (BWY). The British Wheel of Yoga is the Sport England recognised national governing body for Yoga. It’s a tough 200 hour+ programme that usually lasts 2 years.
If yoga teacher training interests you, take a quick peek at the 101 yoga teacher training courses here: http://georgewatts.org/yoga-links/
BWY Yoga Teacher
Free yoga lesson planning tips & tools | http://GeorgeWatts.org