Hair Extension Training Courses

I am a freelance hairdresser and nail technician and I want to add hair extensions to my skills list. Can anyone suggest a course that I can learn the most up to date method of application?

I want the bonds to be fantastic, barely noticable and easily removable as some of my clients would want them temporarily for film/tv work.
Thank you.

if you are already a hairdresser...wouldnt you know where to do extensions???

i know how to do extensions,

i just thought that there would be somewhere in sheffield that i could do the course and get the qualification, the closet i can find one is manchester