Folk instruments

Flute.

The British Flute Society:

http://bfs.org.uk/

The most famous British flutes are:

Sir James Galway: www.jamesgalway.com

Susan Milan: www.susanmilan.com

Lisa Friend: www.lisafriend.com

Violin.

The most famous Scottish violinist is John Law Hume:

http://en.wikipedia.org/wiki/John_Law_Hume

Fiddle.
The most popular fiddler is Yehudi Menuhin:

http://en.wikipedia.org/wiki/Yehudi_Menuhin