Logitech h110 Stereo Headset with mic decent of £4.80, in Sainsbury's Mansfield. They only had 1 left on the shelf.
This usually sells for about £12.50 online.
I don't know if its nationwide, but my guess is yes as Sainsbury's are selling off Logitech gear in other stores. Maybe the geese will be kind to you!
Specs for the lazy people. :D
Additional Features - adjustable headband, noise cancelling circuit
Headphones Form Factor - Supra-aural
Headphones Technology - dynamic
Connectivity Technology - Wired
Sound Output Mode - stereo
Frequency Response - 20 Hz
Sensitivity - -38 dBV/Pascal
Response Bandwidth - 100 Hz
Microphone Form Factor - built-in
Connectors - 3.5 mm audio line-out, 3.5 mm microphone