It's actually an article on de-carbonising the railway, rather than electrification per se.
But there is an electrification map - colour-coloured for Definite, Possible, Unlikely, Battery Trains and Never.
I haven't read the whole thing, but I'd say overall it's too optimistic.
I wouldn't argue too much with the Definites (mainly conurbations and main axes), but the Possibles seem too much to me (North Wales/Marches, S&C, G&SW?).
PS It's worse than I thought, having checked the colour coding again.
S&C and G&SW are both "Definites", and so is the Highland (Perth-Inverness).
I wouldn't argue with Stirling-Perth-Dundee-Aberdeen with Edinburgh-Dundee.
In the same MR issue, it seems NR will present its proposals to DfT in July.
So it will be a while after that before anything pops out in the "approved" tray.