I observed tonight's (Thu 13/06/2019) Lowland sleeper at London Euston. It was formed with just seven Mk5s for the Glasgow portion and the Edinburgh portion was er "to be road coaches"
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Information at Euston was rather poor. Ticket office staff thought the whole service was coaches. Platform staff were unsure where the coaches were to depart from. Rumour is that the computer slammed the brakes on at over 70mph leading to wheel flats and that the seven coaches were the ones with the least flat wheels. Goodness knows where all the spare Mk5s are. Surely there must be plenty spare as the Highland sleeper is still in the hands of Mk3s & Mk2s
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EDIT - Formation of the above Glasgow only was :-
92038
15323, 15322, 15321, 15317,
15207,
15109,
15004,
92010 (rear/left behind)
presumably a 153xx was missing from this Glasgow only train (portion) ?.