Double relay bronze caps off record-breaking worlds for Great Britain

The team had already ensured Beijing 2015 would be their most successful golden haul following two titles for Mo Farah, plus victories for Jessica Ennis-Hill and Greg Rutherford in the heptathlon and long jump respectively.

But they ensured they would finish the Championships fourth in the medal table with bronze for the men's and women's 4x400m relay teams taking Great Britain's overall tally to seven – long jumper Shara Proctor the other podium finisher with silver.

It was the women who got things underway first with two-time 400m champion Christine Ohuruogu charged with the lead off before Anyika Onuora and Eilidh Child put Seren Bundy-Davies in a strong position on the final leg.

With the Americans and Jamaicans already out front battling for gold – victory eventually going to the latter – Bundy-Davies maintained her composure to hold off the rest of the pack and bring Britain home in a season's best time of 3:23.62 minutes.

Attention then switched to the men to see if they could repeat the heroics.

The team of Rabah Yousif, Delanno Williams, Jarryd Dunn and Martyn Rooney had initially completed their stadium introduction with a baby celebration in a nod to captain Rooney, who had become a father for the first time while he was in China.

And the Great Britain captain produced a great last leg to snatch bronze from Jamaica by four thousandths of a second, with the USA taking gold ahead of Trinidad and Tobago.

"When I crossed the line I knew I had got him," said Rooney.

"I am incredibly happy for the guys and happy I did not mess it up.

"It has been a special week having my first child. I did not want to go home empty handed, I wanted to bring something back to my wife to make it worthwhile.

"Hopefully she is proud of what I have done. I can't wait to meet him."

Elsewhere on the final day, Charlie Grice clocked 3:36.21 to finish ninth in the men's 1500m and Steph Twell was 12th in the 5000m.

© Sportsbeat 2015