Panelfold
Folding doors, acoustical folding partitions, operable walls, operable partitions, demountable partitions, relocatable partitions, portable panels, moveable walls, accordion doors, accordion partitions, acoustical panels. In it's fifth decade, panelfold is recognized as the innovative leader in folding doors, acoustical accordion folding partitions and operable and relocatable walls.
http://www.panelfold.com

Sunseeker Doors
Sliding Folding Glass Doors for patios and conservatories from Sunseeker Doors
http://www.sunseekerdoors.com

The Spazio Folding Door
Offering a wide range of folding doors, room dividers, sliding doors and bifold doors for either domestic or commercial use.
http://www.spazio.co.uk