Subsidising that there London, again.
For once a fairly accurate article - daily travel in an around London not greatly affected as daily cap cheaper anyway, but through rail journeys from outside Greater London become more awkward/expensive, especially where evening peak restrictions apply. Not yet clear how train operators (ie DfT) will respond - also Overground/Elizabeth Line not generally affected.
I stopped using travelcards some time ago - they used to offer great value if you were making more than a couple of journeys in London during the day, but now it's usually cheaper to get a standard train ticket into town then use Oyster or a contactless card with the daily pay-as-you-go cap.
First of the "New Year Sales" on Great Western - book by 10 Jan for travel up to 26 April.
Northern as well - travel from £1 (if you can find one)
There's a very helpful Find low-cost train tickets feature, where you can input your start and finish stations, which gives a calendar showing the days when a £1 fare is available between them.
Has everyone who might be interested picked up on this year's Great British Rail Sale? Purchase by 29 Jan, or when the discounted quota runs out, for travel by 15 March.
Just looked at one of them (Trainsplit) and it clearly showed when a split ticket was (marginally) cheaper and when the sale tickets were cheaper. But the overall effect was a much greater choice of trains with a reduced fare. Note though that railcards are not valid in the sale, which makes them relatively pricier for those who have one,