"piemanlarger" wrote
The Airfix GWR brake van to which you refer is in a totally fictitious livery if I remember correctly. It is far too light for GWR livery and has no regional prefix "W" to fleet number.
Having said that there were "unfitted" brake vans for sure - they were almost exclusively used at the end of unfitted freights as accomodation for the guard. Altough without vacuum brakes they were equipped with screw-down friction brakes as were applied by the guard to assist the loco with train braking.
John.