This is TT4019 Mk2F Brake Standard Open coach. Inter City livery Era 7/8 M9534. An early TT gauge coach by Hornby.
Hornby TT4019 TT Gauge BR Mk2F Brake Standard Open Coach Blue And Grey M9534
Hornby TT:120 TT4019 Mk2F BSO M9519 BR
Hornby R40144 Mk2F Brake Second Open Loram Rail Operations 9525