Gemini GU51524 Noise Canceling Headphones on sale at B&M for £3.99 (currently selling for £23.95 on Amazon).
Supplied with carry pouch, AAA battery and airplane adaptor plug, the headphones fold flat for easy carrying. Noise canceling feature activated by a small switch on the left earphone.
B&M have stores in Northern England, Midlands and Wales, website at www.bargainmadness.com