Tim Benjamim has been included in the GB team

The 400 metre runner ran the quickest time in the UK this year on Friday night at the London Grand Prix.

Benjamin has had a torrid season so far having missed large parts of the outdoor campaign with a foot injury.

Elsewhere 400m hurdler David Greene has been included as a travelling reserve, with Newport sprinter Christian Malcolm also added to the 4 x 100 relay squad.

Malcolm's fitness will be monitored at the UK Athletics holding camp in Macau from 10-22 August.

606: DEBATE What do you think of the GB team? Have your say

Meanwhile Christine Ohuruogu will make an instant return to international competition after serving a one-year ban.

Ohuruogu has been picked for the individual 400m and 4x400m relay, one day after her ban for missing three out-of-competition tests expired.

Sprinter Mark Lewis-Francis has also been handed a place in the second and final wave of selection.

He edged out Simeon Williamson for the final spot in the 100m.

But there is no place in the team for Lewis-Francis's fellow Olympic 4 x 100m relay gold medallist Jason Gardener.

Gardener, who has announced he will retire at the end of this year and who has failed to reproduce top form this summer, has been excluded from the relay squad.

The selectors have preferred Becky Lyne for the remaining 800m slot ahead of Jenny Meadows, who has beaten her twice over the distance at recent IAAF Grand Prix events.