As I see it NR» are refusing to be pinned down on a date for Swansea because of all the problems they've had with slipped targets and cost overruns meaning whatever date they give is likely to be a bit of a guess until they've had chance to complete or nearly complete other areas of the electrification. They've said CP6▸ which could be anywhere from 2019 to 2024. It's clearly not going to be 2019 as Cardiff is only expected to be finished by December 2018, and I doubt it'll be as late as 2024, so I would imagine 2021/2 is most likely.
So Swansea electrification is still supposed to be CP6 then? If so, good, that's much more reassuring than 'postponed indefinately'.
There will be uproar West of Cardiff then if that is the case
The Bi-Mode
IET▸ 's should be quite happy on diesel engines west of Cardiff for those intervening years and will likely reduce the journey times of the current
HST▸ fleet on the section from Swansea to Cardiff, so why will there be uproar?
Swansea-Cardiff was promissed infrustructure investment, if that investment is 'cancelled' then I would think uproar is understandable. Plus it isn't only the London trains, no wires means the Swansea-Cardiff stoppers (and possibly Maesteg line services depending on whether Cardiff-Bridgend is counted as part of the ValleyLines project or Cardiff-Swansea) will probably be stuck with 150s rather than getting
EMUs▸ (which given the Anglia fleet replacement might be modern Electrostars) as part of the Cardiff metro plans.