Quoting from that report:
At First Great Western we have made good progress on a significant programme of investment to refurbish our High Speed Train fleet, which will deliver capacity and performance uplift to that franchise. We are on course to fully complete the refurbishment by early 2008.
The refurbishment was scheduled for completion by the new timetable in December, and said to be necessary to allow 125s to stop at shorter platforms (selective door opening element). Might this cause a problem with certain extra stops?