Mr Thant wrote:

* There's a mixture of seats including sideways, cross ways and fold
down. I
have to say I don't like the angle of the seats for long journeys on the
Met.

The carriage on the left is Met (mixed longitudinal and transverse),
the one on the right is Circle/District (transverse both sides).

Interesting, since my recollection is the carriages are being billed as for
all four lines. (And the map diagrams inside are all Mets.) This does sound
as though a spanner has been put in the works of trains that can easily
switch lines as and when necessary.

* The carriages will be used on all four sub-surface lines with platform
lengthenings where necessary (and presumably also track variations).

The Met will still have its own unique trains. (8 vs 7 cars and a
unique seating layout)

As I said in my other post, I think this will continue the problems at some
Circle/H&C/Met stations. The Liverpool Street to Moorgate portion of my
trips often involves a lot of guesswork about where the end car will stop
at.

(How likely is a Wimbledon to Barking via Baker Street through service
when
the Embankment route is out of action?)

You'd still have to find a drivers that are trained on all the parts
of the route.

True, but if the stock is transferable can the drivers also be trained for
redeployment and specials where necessary?