It is unclear how long this will remain, reliability is poor even the MK4 sets were better out of the box. Realistically there should be 1000 miles on the clock before going into service, the second set had about 100 from what I can see.
Long standing 29k passengers will have noticed the floor is starting to collapse on most units so there will be a need for a major engineering job to replace the floor structure and that means fewer units available
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