Now throw in the number of years it will take to do those upgrades plus the number of years they will be delayed to get it started in the first place.
The process is already well underway. Timescales are tight, aren't they always, but much of the preliminary work has already been done so they are not starting from scratch right now. Whether all the Mk2s are in service by 2012 remains to be seen, but we should be good way along at least.