The Minister of State in the Welsh Office, David T.C. Davies, again last week defended the cancellation of the electrification of the south Wales main line to Swansea, by arguing that it would not have produced any benefits to passengers. Now, decarbonisation, quite apart from its positive environmental impact, would have had the pretty substantial benefit to passengers of not poisoning them. Though rail infrastructure is not devolved, with the exception of the core Valleys lines, air quality is. So, to what extent can the Welsh Government compel the UK Government to reverse its electrification u-turn and stop treating Wales as the fag end of Britain's railways?