HST power car 43315 leads the 13.06 King's Cross to York through Potter Bar station with its first stop coming in ten miles time at Stevenage. 43208 is at the rear of the train that was seen having its windscreen cleaned at King's Cross a little earlier....
https://www.ontheupfast.com/v/photos/21936chg/27085853204/x43208-13-06-london-king-s-cross Of the two power cars, the oldest is 43208 being an an early Western Region one as part of 253004 dating from 1976, having now given an amazing forty-three years in service!