Richard Goodman scored a double victory in the National Junior League in Bromley. He won the 800m in 1:57.54 and the 1,500m in 4:01.50, both by convincing margins. It followed a similar double victory two weeks ago in the NJL, on that occasion over 800m and 3,000m.
Goodman, 18, said: "I have stepped back this month to run at a regional rather than national level, and used the races to try out different strategies I might use in important events.
"One thing I have learned this year is the danger of allowing training to dominate one's life.
"Things are going much better now and all my preparation is focused on the Under 20 3,000 metres at the Crystal Palace Diamond League meet next week."
Ultra-marathon runner Nathaniel Lane (32:55.67) finished second in the Welsh Senior 10,000m Championships in Cardiff.
Sam Shindler-Glass, 14, shaved a fraction from his 800 metres best with 2:02.26 in Watford.Jamie Cohen, 11, cut his 1,500m best to 5:10.19 and won the 'B' string high jump with 1.35m in the Young Athletes League in Hendon.
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