The NSAA head coach finished second in the 100m after a poor start in a disappointing 11.51 seconds to collect another medal.
His second medal of the day came in the 200m. Millard cruised around the bend and found himself eight metres behind the leader.
His strength told as he ran almost everyone down, missing out on a victory by just 0.07 seconds, again winning a silver medal.
The 4x100m relay saw a third place finish for the team, Chris running the final leg and being left with too much to do to run down the French team.
Millard maintains his record of having won medals at every event entered in 30 national and international competitions.
This weekend sees a tough event in Birmingham as he defends his 100m title at British Championships.
Having been struggling with an Achilles injury so far this season, Millard will wait until after this weekend's event before deciding whether to attend the World Championships in Finland later this month.