Since 1977, route number 303 has been used for services between Kidderminster and Worcester, first by Midland Red Omnibus Company Limited (MROC), then it's descendant company Midland Red West, and more recently by Diamond Bus. Because the 303 number has been associated with this route for over 40-years, it is widely assumed to date back to the late 1920s, like other historic Midland Red routes such as Service 144 and Service 420, but in reality the route number has been reused a number of times since the mid-1920.
On Saturday 16th May 1925, Birmingham and Midland Motor Omnibus Company Limited (BMMO—Midland “Red” Motor Services) renumbered their network with route numbers being grouped into geographical areas. At this time, Leominster Market Day Service 90A running between Hereford, Bush Bank, Goldern Cross, and Leominster, became Service 303.
This service ran on Fridays only for Leominster Market Day, with one journey to Leominster in the morning and one return journey to Hereford in the afternoon.
The network was again renumbered on Saturday 11th February 1928, and at this time the Hereford, Bush Bank, Leominster service became Service 426, but this was short-lived and the service had been withdrawn by the summer of 1930.
| 3 | 0 | 3 |
| November | 1927 | Hereford ↔ Leominster | Withdrawn Feb 1928 |
By January 1931, route number 303 was being used by Birmingham and Midland Motor Omnibus Company Limited (BMMO—Midland “Red” Motor Services) for a local Kidderminster route between the town centre and Sutton Farm Estate. This version of the route was very short-lived and route number 303 was already in use on a different route during 1932.
| 3 | 0 | 3 |
| January | 1931 | Kidderminster → Sutton Farm → Kidderminster |
During 1932, Service 303 operated three daytime return journeys during the week between Stourport (Car Park) and Lickhill (Garland Road). Three additional evening return journeys were operated on Fridays only. This route was not operated at weekends, and the 1200 journey operated over a different route during school term times.
| 3 | 0 | 3 |
| March | 1932 | Stourport ↔ Lickhill |
Service 303 running between Kidderminster, Great Witley, Abberley and Menithwood was in operation by the early 1950s, with between three and five journeys operating throughout the whole week. Additional short-workings were provided on Saturdays by Service 320 between Kidderminster and Pensax Court.
In the early 1970s, BMMO withdrew a large number of their rural services and both Service 303 and Service 320 were withdrawn on Saturday 3rd April 1971.
| 3 | 0 | 3 |
| October | 1954 | Kidderminster ↔ Great Witley ↔ Menithwood |
On Saturday 5th November 1977, Midland Red Omnibus Company Limited (MROC) launched their “Wendaway” Viable Network Project (VNP) in Kidderminster and surrounding area. At this time, the long established Service 315 running between Stourbridge, Kidderminster and Worcester was withdrawn and replaced by new Service 303.
Midland Red Omnibus Company Limited (MROC) ceased trading as a bus and coach operator at the end of services on Saturday 5th September 1981. Responsibility for Service 303 passed to the newly formed Midland Red (West) Limited from the following day.
| 3 | 0 | 3 |
| April | 1978 | Worcester ↔ Kidderminster ↔ Stourbridge |