I'll confess I'm not in the know here, and perhaps it would have been useful if the story had done some more digging on this.
I seem to recall the British Government (through BNFL) sold Westinghouse to Toshiba. About 12-18 months later they announced we needed to build (some badly needed) new Nuclear power plants with much gnashing of teeth from those who pointed out we'd recently sold the in house capability to do just that.
With Toshiba writing down the value of the purchase substantially "The 2006, $5.4 billion acquisition of Westinghouse [..] writ[ten] down [..] by $2.3 billion." does that mean HM Gubbermint dodged the bullet of hanging on to Westinghouse or are these problems caused by Toshiba's ownership? $2.3bn may be peanuts compared to the savings of having built new nuclear in house though, but I'm sure Sir Humphrey would have meddled in new build whether Westinghouse or EDF/Areva...