Meanwhile, back in 144e discussion land...
If this is deemed successful and necessary (i.e. need to make some of the Pacer fleets fit for post 2020 operation), what could be the impact?
Given the terms of the Northern franchise to be rid of Pacers and GW wiring to free up some Thames valley 165/166s for cascading 143s and 150s away from the west, I'd suggest the 8x GW 143s go to Wales to displace a similar number of 142s for scrap. The entire 144 fleet also move to Wales, displacing the remaining 142s and their 153s, plus giving an overall fleet increase, which has been desirable. 23 units (38 vehicles) out, 31 units (72 vehicles in) with 143/144s concentrated on the valleys with a few 150s moved to replaced the 153s elsewhere.
Northern loose 56 vehicles, but receive 17 150/1s from FGW (34 vehicles) and the 8x Welsh 153s - a net loss, but Northern, as we know, should expect some new vehicles and cascaded 156s, 158s and possibly 170s from ScotRail, plus the benefits of the remaining wiring plans.
Of course, much of this depends on the wider impact of delayed electrification plans all over the country...
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If you look at the thread on wnxx a number of enthusiasts are saying 442s will never appear on Scottish services, only North TPE and are refusing to explain their reason for saying that.
An issue with loco-hauled 442s on Scottish services could be the proposed portion working options, but then multiple units could be used on the services which join/split and 442s on the rest. However, the issue might then be the operator may not want a micro fleet of electric locos.
Indeed, the quote I've been given is specifically for Liverpool-Newcastle services. Also of note is that 8x 442s are expected to be retained by TSGN for a couple of peak time Eastbourne diagrams, hence only 16 units available for use as hauled stock. Covering all hourly Liverpool-Newcastle turns would seem to suggest 8 diagrams required.