Birchfield Harrier Jade Surman finished ninth overall in a high-quality heptathlon competition with a lifetime best score of 5,241 points at the IAAF/Maroc Telecom World Youth Championships.
Surman, who set two personal bests in the two-day competition, was no match for Russia's Tatyana Chernova, who won with a championship record tally of 5,875 points.
Fellow Russian Yana Panteleyeva tallied 5,611 points and third-placed Diana Rach, of Germany (5,481), was third.
Harry Aikines-Aryeetey became the first sprinter in the six-year history of the championships to win the 100 metres and 200m gold medals.
The Carshalton 16-yearold, having won the shorter race title on Thursday, powered to another magnificent victory over 200m in his final last night.
Aikines-Aryeetey turned the tables on Cuba's Jorge Valcarcel, who was given the verdict in their semi-final although both had finished with the same time.
In the final, the Surrey sprinter controlled the race from start to finish and won in a world leading time for the year of 20.91seconds.
His pace saw him easily overthrow Valcarcel and Matteo Galvan, of Italy, although both rivals ran personal best times of 21.08sec and 21.14sec.
He became the second British champion over the distance, following 1999 winner Tim Benjamin, now an international 400m runner.
Last year's Commonwealth Youth Games runner-up, who beat 21 seconds for the first time, was unaware that noone had achieved the demanding sprint double.
Emma Jackson and Carolyn Plateau, outside medal bets for an 800m medal, finished fifth and sixth in their final.
Neither could match the pace of Kenya's Flavious Teresa Kwamboka and Winny Chebet who won in two minutes, 7.42 seconds and 2mins 8.15secs ahead of Australian Katherine Katsanevakis who clocked 2:08.35.
The British pair were still in the race with 200m to go but, when Kwamboka surged into the lead on the final bend, she split the field apart and they finished in times of 2:09.17 and 2:09.19.
Laurence Cox finished ninth in his 1500m contest where the winner, Belal Mansoor Ali of Bahrain, scored a runaway victory in 3min 36.98sec.
Cox could not live with the super fast pace and clocked 3:54.73. Ireland's Ciaran O'Lionaird, a place behind him, recorded 3:59.00.