Dear All   Looking at GWR Wagons by Atkins et al (revised 1998 edition), the Lot numbers of the undiagrammed vans with outside-framed wooden bodies reads as follows:   osLot157, 50 vehicles, completed 1878, wooden underframes osLot199, 1 pattern vehicle, ? date, bulb iron underframe osLot225, 100 vehicles, completed 1881, bulb iron underframes osLot239, 200 vehicles, completed 1886, bulb iron underframes osLot339, ? vehicles, 1885 (ordered?), bulb iron underframes o