Headset extension lead/extension cable with break-proof metal plug – 3m (extension cord for use with a PC headset or headphones, 4-pole, 3.5mm male to female) by CableDirect: Amazon.co.uk: Electronics & Photo
Headphones Extension Cable Cord Line 3.5mm Audio Splitter Wire,3.5mm Male to Female Replacement Stereo Audio Cable Aux Extension Cords Compatible with Bose QuietComfort QC45 QC35II QC35 QC25 QC15- 4FT : Amazon.co.uk: Electronics
Headphone Extension Cable,3.5mm Male to 3.5mm Female Audio Extension Cable Adapter,0.5m Audio Cable Extension Cord for Smartphone,Tablets and other 3.5mm Devices: Amazon.co.uk: Electronics & Photo
MU2MMFS - StarTech.com 2m Slim 3.5mm Stereo Extension Audio Cable - Male / Female - Headphone Audio Extension Cable Cord - 2x Mini Jack 3.5mm - 2 m (MU2MMFS) - audio extension cable - 2 m - Currys Business
QED Performance 3.5mm Headphone Extension
1.3m Audio Cable Extension Wire Cord with Mic Quiet Comfort QC25 Headphone For BOSE on OnBuy
CableCreation 3.5mm Headphone Extension Cable 4.5M, 15 Feet 3.5mm Male to Female Stereo Audio Cable with Gold Plated Connector,Black and White : Amazon.co.uk: Electronics & Photo
5m Headphone Extension Cable | 3.5mm Jack Audio Lead Male to Female | Cables4all