Can't guarantee this is nationwide. but you may wish to have a look next time you're in your local Tescos. I just picked up the last two in the Tesco store in Culverhouse, Cardiff.
The earphones were marked up at £1 on the shelf - I took the shelf tag to the desk expecting a higer price on scan, but it scanned at the till at £1. I already own a set of MXL 70 VC (same as MX 70 VC but with a lanyard) - not the world's greatest earphones by any means but no complaints for a £1. They're £8.99 at Play and £17.60 at Amazon! The above rrp is from the Play website.
Can't find them on the Tesco website - must be clearance stock. INSTORE ONLY!!