Limited stock but appears to be national.
Sloped off from work early today to get to Stoke to pick a pair of these up. Not available for home delivery. There's limited stock in-stores around the country. Stoke had 2 pairs left after the ones I bought. Liverpool were showing stock last night. Non in Manchester, Stockport or Macclesfield.
Have a search, see if you're lucky. The PC World website isn't the best for searching by location on the mobile site, desktop seems to be marginally better.