Going Forward Buses of Goring operates a minibus service on Mondays from Wallingford to Didcot via Long Wittenham. See the website (below) for details.
A single fare is £4. Children five to eighteen will travel at half-price. The bus accepts concessionary travel passes.
More information and timetables can be found on the Going Forward Buses website.
Thames Travel operates a service linking Didcot with the Culham Science Centre and Berinsfield. There are seven buses a day, five days a week, Mondays to Fridays.
Bus Service 95 runs between Didcot Station and Culham Science Centre, stopping at the Orchard Centre, Ladygrove shops, The Plough and Clifton Hampden Post Office. Service 95B operates between Didcot and Berinsfield and will also call at Long Wittenham and Clifton Hampden.
See the Route 95 and 95B timetables on the Thames Travel website.