All three of Britain's women's 1,500m runners advanced to the semi-finals during the morning session at the Olympic Stadium.
World Championship silver medallist Hannah England always looked well placed in her heat.
England, whose build-up has been hampered by a spiked Achilles tendon she suffered in a race in May that kept her out for around six weeks, came home fifth in four minutes 05.73 seconds.
Lisa Dobriskey showed she was getting back to her best by winning a slow heat in 4:13.32.
Laura Weightman, who is trained by former world-record holder Steve Cram, finished sixth in the third heat in 4:07.29.