Hah!
"HM Revenue and Customs is running 25 major IT projects worth at least £197m, but is unwilling to provide accurate estimates."
AFAIK due to the way they (and other gov depts) put together (or have put together for them) contracts with EDS and all the other shysters feeding at the pork barrel, they are, in fact, _unable_ to provide accurate estimates. So in all probability, the other departments were simply lying and HMRC represents much more realistically the general state of play vis a vis IT project costs in government.
That's what I heard, anyway.