It's mainly because we've got to the point where we need to replace our communications network, and no ones wants to pay for it, short sightedness of Margaret Thatcher (I heard, from someone?) on choosing the type of network that was installed before, or not to upgrade it at some other point in time.
Dark Fibre sounds pretty cool too, although I dont understand it much, and would love someone to explain it to me in "normal for a techie forum" terms.
In the 80's BT went to Thatcher and said "We'll pay to put fiber to the home for everyone in Britain if you let us run TV over it" Thatcher though that was too monopolistic and said no.
Jesus, can you imagine if the UK had 10Mbit or better net access right from the dawn of the internet when the rest of the world was on dialup? We'd have absolutely dominated the tech industry.
Ah well, so much for hindsight... can't really blame Thatcher that much - Internet was non-existant then so she didn't know the extent of what she was doing and there's no question that BT would have crushed all competition with that kind of advantage.
Personally I feel that the government needs to bankroll an open access fiber system, funded through the BBC and our TV license - with fibre to every home they could probably recoup much of the cost by selling off the now unneeded TV wireless spectrum for mobile phone use - Mobile bandwidth demands are currently skyrocketing with the growth of touchscreen smartphones like the iPhone, and operators need all the bandwidth they can get.
Dark Fibre is basically this: Whenever anyone lays down fibre, because the cable itself costs relatively little compared to the cost of digging up the ground, everyone lays far,far more than they are actually going to use so they never need to dig up the road again.
Dark fibre is these unused links.
It's only really useful for big companies like google - they can buy or rent some of the unused links between cities very cheaply and use these to build their own network instead of paying money to an ISP.