[2] Lock won four consecutive 60 metres titles at the WAAA Championships.

[5] She successfully retained her title at the 1937 WAAA Championships,[6] before moving to the Mitcham Athletic Club.

Lock secured a double success at the 1938 WAAA Championships, winning both the 60 metres and equalling her own British record and becoming British 100 metres champion, setting a Championship record of 12.2 seconds.

[7] The following year in 1939, Lock retained both titles at the 1939 WAAA Championships and once again equalled her own 60 metres national record.

After World War II, she continued to race for Mitcham AC until 1950[9] and finished second behind Doris Batter in the 100 metres event at the 1949 WAAA Championships.