The Great Western Railway did have some Collett all first coaches. They were 60'1" and built to diagrams A20 (lot1581), running numbers 8043-8052 of 1937 and A22 (lot 1586) , running numbers 8092-8111 of1938. This information can be found on pages 230/231 of Jim Russells excellent book - A picture of Great Western Coaches Part II (1903-1948).
Which trains they were used in I can't say but there were obviously occasions where coaches were added to the regular formations due to extra bookings, or charters.
As in all modeling there was sometimes a prototype for every occasion.
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