Angle & Curve's domain name, angleandcurve.com, belongs to a company called Sefour, a London company who appear to resell various bits of DJ equipment. Sefour only stock one type of headphones, and that's not the "Angle & Curve". That in itself is odd.
What's also odd is that when I first visited, angleandcurve.com didn't appear to have any online retail presence. Now it does have a shop, but it's not immediately accessible. The website is one of those that annoyingly plays music at you even though you never asked it to, and fails to stop the music on the page that has a YouTube video. It also looks like there might be a bit of Engrish in there: "Angle & Curve is headphone manufacturer [...]"
One might suspect that the company sprung up in order to satisfy a requirement from Orange to push out a promotion promising high quality headphones but without actually costing very much. If they're really worth £60, how would it be economically viable to give them away with a £40 handset that's not bound to a contract?
It may also be a possibility that poor reception (I've not managed to find many reviews of the A&C headphones, but the ones I did find were not favourable) forced Sefour to ditch the whole enterprise. At which point Orange swoop in, and say "Keep the website up at least until we've shifted this lot, yeah?" - Sefour keep offering the headphones at £60, and people believe they're WORTH £60. Buyer beware - if A&C disappear after Christmas (the Orange promotion runs til 24th Dec), who's going to deal with the manufacturer's warranty?
Third option is that Sefour cast out the net for brand-awareness building opportunities and Orange got in contact - fine, but the growing awareness is that these things are sent out with cheap phones that are "worth" less than the headphones. And that still doesn't stack up.
A&C's "classic" headphones look REMARKABLY similar to the Eskuche 33 1/3 which also retail at £60 - except Amazon sell the A&C at £35 while A&C still sell at £60.
http://www.amazon.co.uk/Eskuche-33-Ear-Headphones-Black/dp/B003N1W1A0/ref=cm_cr_pr_sims_t
http://www.muazo.co.uk/Eskuche_Headphones/Eskuche_33_Silver_Headphones
That confirms my suspicion that these are probably cheap generic headphones produced in a Chinese factory before being stamped with their client's name & logo.
Probably something like (by which I mean "exactly") these:
http://www.alibaba.com/product-gs/343333970/stereo_headphone_MY_6730_.html
You might wonder what my point is. Loads of stuff gets made like this. But I do not believe these are worth £60. I do not believe Angle & Curve, or Sefour, employ any staff who have properly scientifically researched headphone technology and come up with what they honestly believe to be The Best headphones for their price bracket. But that's their marketing pitch, and that riles me something rotten. Angle & Curve repeatedly make claims about drivers and style designed in-house. They clearly haven't been.