From Victoria Underground Station Tube to Oxford Circus Underground Station, Tube to London Paddington, then train to Didcot Parkway. 1 h 11 min £29. From Victoria Station Oxford Tube bus to Oxford City Centre, St Aldates (Stop H3) then bus to Didcot, Parkway Station. 2 h 34 min £16. From London Victoria Station drive to Didcot. 1 h 11 min £10.