Looks like the UK government are going for... Ernst and Young :S
We've brought in Ernst & Young to help us explore the possibilities. Reconfiguring our internal networks to free up addresses carries a cost, so we need to account for that, and we're keen to keep our public services running without disruption if we do transfer them. So there is much to consider.
Getting an accountancy firm to design your technology infrastructure... yep, that makes sense!
This is a particular shame as the GDS have, in the past, demonstrated themselves to be one of the more technologically sane branches of the UK government. :(