Maybe someone else can confirm, but that doesn't look like any TFL carriage i know. In fact, it looks a lot more like moscow: http://thumbs.dreamstime.com/z/inside-modern-subway-car-1214...
and was posted on EnglishRussia a week ago: https://twitter.com/EnglishRussia1/status/697017291494596608
It may have existed before this...