King ran 13.56 seconds to claim bronze in the 110m hurdles final behind Brazil’s Eduardo De Deus and Italy’s Hassane Fofana.
That was quicker than the 13.58 second run he produced to take second place at the Josefa Odlozila Memorial Meeting in Prague last week.
King’s target is 13.46 seconds, which is British Athletics’ qualifying time for this year’s World Championships.
Fletcher clocked 16.43 minutes for the multi-terrain run around the National Trust property to finish one minute and 17 seconds ahead of his club team-mate John Porter, who was second in 18.00 minutes. Plymstock Road Runners’ Graham Bale was third in 18.16 minutes.
Freya Porter was first women in 19.36 minutes, with City of Plymouth’s Talia Sullivan second in 20.26, with Erme Valley youngster Bella May just behind in 20.29.
Full results can be found HERE.