Secrecy was a great cover for spectacularly bad work.
TBH that would be my suspicion as well (I noted BAe subsidiary walked away from the public national ID card scheme but they very involved in the very secrete "Controlling the Internet" project out of GCHQ).
And where BAe leads, massive cost overruns are sure to follow.
But without inside access it's impossible to know.
Which is why "It's secret" should always be viewed with extreme suspicious as a cloak for "We spent a f**kload of money and achieved little or nothing but we don't want anyone to know because y'know, it could make us look bad."