Table:
text: 1950 British Grand Prix
Entries
Entries
Driver Entrant Constructor_ Chassis Engine Tyre
David Hampshire Scuderia Ambrosiana Maserati Maserati 4CLT-48 Maserati 4 CL 1.5 L4 s D
Leslie Johnson T.A.S.O. Mathieson ERA ERA E ERA 1.5 L6 s D
Peter Walker Tony Rolt Peter Walker ERA ERA E ERA 1.5 L6 s D
Joe Fry Brian Shawe-Taylor Joe Fry Maserati Maserati 4CL Maserati 4 CL 1.5 L4 s D
Cuth Harrison Cuth Harrison ERA ERA B ERA 1.5 L6 s D
Bob Gerard Bob Gerard ERA ERA B ERA 1.5 L6 s D
Yves Giraud-Cabantous Automobiles Talbot-Darracq SA Talbot-Lago Talbot-Lago T26C-DA Talbot 23CV 4.5 L6 D
Louis Rosier Automobiles Talbot-Darracq SA Talbot-Lago Talbot-Lago T26C Talbot 23CV 4.5 L6 D

text: 1950 British Grand Prix
Entries
Entries
Driver Entrant Constructor_ Chassis Engine Tyre
Geoffrey Crossley Geoffrey Crossley Alta Alta GP Alta 1.5 L4 s D
Raymond Mays Raymond Mays ERA ERA D ERA 1.5 L6 s D
Sources: Sources: Sources: Sources: Sources: Sources:

Question: What is the driver of the 1950 British Grand Prix with Era 1.5 l6 S engine and Era B chassis?