It's shameful political posturing that has happened from both Tories and Labour since the 80s. The UK has needed a national power strategy for decades yet neither government wants to invest in it as the delivery is likely to come when their opponents are in power. Far better to say you're fixing something now, much like hospital PFI schemes, then let the next government pick up the over-inflated bill for it when it finally delivers. Why would Cameron, Clegg and co care about what happens 10 years from now when the power generation from these reactors kicks in, they'll be long gone as a political force.
Take, for example, if Labour had decided back in 2005 to seriously consider investing in nuclear power plants, rather than wasting £10bn on ID cards from 2005-2010, then we'd be looking at the first of 5 new nuclear plants due to come online in a couple of years and, what's better, we'd own the things that we could then lease to power companies. If Major had decided in 1995 to do the same then we'd be wondering what all the fuss was about on the global energy markets as we'd be able to provide our own electricity at bargain basement prices through the state owned plants already running.