New Welsh Secretary Stephen Crabb turns to one of the items at the top of his in-tray today -the row between the Welsh and UK governments over who pays for the electrification of the Valley lines. Ministers in Cardiff Bay say Mr Crabb's predecessors, Cheryl Gillan and David Jones, were quick to claim the credit for the giving the multi-million pound project the go ahead, so there's no way that the bill should be passed on.
Today Mr Crabb will hold talks with this cabinet colleague, the Transport Secretary, Patrick McLoughlin. The Transport Department argues that as the Welsh Government manages the Wales and Borders rail franchise, it should be responsible for repaying the cost. That would mean either funding a bigger subsidy or putting up the fares.
Only yesterday, the Prime Minister defended what he saw as a done deal but ITV news understands that there might at least be a concession over how quickly the money needs to be repaid. A senior Welsh Government source was also optimistic that the dispute could soon be settled.
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As far as temperatures go, it's going to feel pretty uncomfortable out there tonight - warm and muggy with mist patches in places.