These noise-cancelling headphones by Sony were around £50 when new. Currently selling them for £25 plus £5 p&p.
They require 1 AAA battery for the noise-cancelling function. They have the ability to work without the noise-cancelling function. I will also include an adapter so that they can be used with aeroplane in-flight entertainment systems.
They have been used only about 3 times and are in excellent condition.
They also come with a black carry case.
£25 plus £5 p&p. Payment is via paypal. Collection in London is available.