Recycle Invincible class when CVF's come?

Hi there,
When the news carriers come when ever that is (2010/2015)how about converting the 3 Invincible class carriers into 3 Ocean class ships for transporting Marines etc. This should be relatively easy as HMS Ocean’s hull is based on the same as the Invincible class’s hull. This would greatly increase Britain’s strategic transport.

Also it fits in with Labour’s defence motto,”We want to get the most for the least money possible!” (or vice versa considering the millenium dome!)

What are your views on this idea?