@tfewster didn't see the original comment, but thumbs up for looking it up!
Mathematical impossibilities aside, let's just be clear that nobody has made their millions selling a Belkin cable to public sector at 1929% markup. Let's say it's a £1.30 3m Cat6 cable, that only makes it £26.38 ex VAT sell to the customer. Now obviously that's a HUGE rip-off for what it is.....but that doesn't change the fact that it's just £26 and change.
And let's be honest...it's still got nothing on Monster cables in Currys.