Also, as has already been posted there is some disgust "up north" about the allegedly old class 319s to be transferred. Until a couple of years ago I travelled on them regularly, and whilst I had a very low opinion of the then thameslink franchise, this was not in general due to the rolling stock.
In my view, capacity is a huge problem, age of rolling stock is a non problem.
If there were ever to be a "steady state condition" of the country's entire rolling stock fleet, then with design life of
EMUs▸ being 40 years or more, and with planned replacement and additions at a reasonably controlled pace (rather then the feast or famine of the last 15 years or so), then people ought to accept that new trains should only come round every couple of generations...
One of the main issues is that the south east slam door replacement, and to a degree the requirement for Thameslink whole fleet replacement, has skewed perceptions, just because of the vast numbers involved. But there will be new trains going directly to the north and Scotland, and now Anglia is getting a full fleet upgrade including all the rural routes that may well release fairly new AC EMUs all over the country.
Could look totally different in a decade...
Paul