Elfyn Llwyd protested at the delay in confirming the extension of GW electrification from Didcot into South Wales. He has a point. As I understand it, the timing depends on a decision whether to order all-new train sets or to adapt the existing HS125s (refurbished not all that long ago) to electric working. There are also implications for ESW freight.
However, it seems from this report in the Independent of February 27th that this link with the plans to replace all the ageing InterCity trains was made long ago.