Part of a batch of four vehicles supplied by Brown, Marshalls & Co., Ltd., of Birmingham in 1881 (F.9-F.12) this carriage is part of the backbone of the service fleet and has rarely been out of traffic.  It is an all-thirds composite identical to F.11 featuring six third class compartments, the middle four having shoulder-height partitions.  It was withdrawn in 2019 and stored for a period, returning to use owing to traffic demands in early 2021 in poor condition.  Sister carriage F.11 was rebuilt be off-site contractors and returned to home metals in 2022, at which point F.10 was removed for rebuild by the same contractors where it remained until completion and return, entering traffic again in at some point in 2025 being the current expectation.