Most of the buses you ask about did exist however I don't think 3683 existed, 3790 was briefly an L reg OK Atlantean 4826 - 4828 (NPJ475R/RAU602R/THX190S) were originaly Readby Nationals 4831 (YBO331) was an ex Readby Leopard I think 4799/4800 were ex Readby or Diamond but acquired as withdrawn vehicles and not used, 3805 was an OK Olympian F105UEF that caught fire on the A1 near the Metro Center which was considered for re bodying but this never took place. However the chasis remained for several years afterwards. 4829 (G23UJR) was an Ok Scania. Most of these buses led short lives after the re numbering mostly due to being non standard. At take over of OK Travel most buses were numbered into the 9xxx series with a few in the 28xx series before the remaining vehicles were re numbered into the main fleet. If anyone can correct me on this please do so.