So it's very likely the exact same end of the carriage shown will end up on southeastern's networker fleet?
I do hope not, or not if I might travel on them and have any requirement for seated use of the facilities, anyway!
FWIW, this kind of approach is something that I think is going to come back and bite designers of disabled-accessibility in the next 30-40 years or so. People are getting taller, and older people tend to get back problems and find it difficult to bend over. Yet "accessibility" seems to mean only "wheelchair accessibility"[1], which means putting things lower down. These things will be impossible for a tall person with a back problem to use.
With regard to trains that means not designing such stupidly cramped facilities as this one (especially as it's not as if the cubicle itself is short of space). But it also probably means two open buttons at different heights (or disregarding the wheelchair in the case of the open button, as until platform heights are brought to be equal to train door heights a wheelchair user cannot exit a train without staff assistance anyway), and things like cash machines needing to consider having keypads and screens at two levels, or two machines always being provided, one at standing-average-adult height and the other at wheelchair height.
[1] Low floor buses are another example. Older people often used to use the door handrail and centre pole to help them to board a bus - but they can't now because it has been removed in favour of wheelchair access. While this is understandable for single-door buses (better that one person finds it more difficult to board than that another cannot board at all) it is surprising that TfL buses, which board wheelchairs via the rear doors, have not reinstated it for that reason, or considered a narrower front door.
Neil