Sony MDR AS 400 and 400 i/p for £10 at tesco in Plymouth. They are reduced to clear so assume these can be found in other stores although probably not all. Mixed reviews on amazon / play ect but this may help someone. Other shop prices range from £16 - £35. RRP is supposed to be £50 but doubt they have ever been that price for more than a day.
Doesnt appear to be online