Oh No, Not This One Again...
So, the desire for finding the elusive "efficiencies" through the magic of outsourcing might be tempting to some.
I would like the opportunity to ask each and every person who is hoping for "efficiency savings" from an outsourcing (or any other) proposal What is your intended method of determining efficiencies, be they relative or absolute?
Being able to have a problem solved within 10 minutes is clearly more efficient than having it take all day. Being able to solve the same problem for £1 is clearly more efficient than a solution that costs £100. What you are highly unlikely to achieve is a solution costing £1 that only takes 10 minutes to apply. And yet time after time managers convince themselves that the latter is possible, and doubtless potential bidders will whisper all sorts of assurances about how they can actually do it.
Then - via some mysterious process - any penalty clause in the draft contract will somehow not appear in the signed version.