185s, remaining based in Manchester, covering principal services from there to Holyhead and Cardiff, plus Holyhead to Cardiff, alongside 175s would seem logical. Some 2-car 175s used to displace 150s and 153s from North Wales with the 150s heading to the Valleys and no longer seen on any long distance services, for which they are not suited. 175s on the Bidstons might seem a bit of a waste, but it would keep the Chester-based 175s up north and eliminate the need to have some north-south services with 150s in order to get them up there. 175s replacing 158s on the Brum-Holyheads would allow for more capacity on the Cambrian and perhaps 158s on the Central Wales line, which would be covered by these Mach/Shrewsbury based units as opposed to the current CF 150/153s.