I had the same problem with tickets but i found a site to buy them.u can get them @ seetickets. follow this link 2 buy tickets for the gig in cardiff
http://www.seetickets.com/see/price.asp?code=409999&userid={174E0850-D387-4D9D-9039-4A0A40DBAABA}&filler1=see&filler2=art-srch