Miley has barely been out of the pool in Chartres and ended day one by claiming her fifth European short course medal with silver in the 200m medley behind in-form Hungarian Katinka Hosszu.
And the 23-year-old Scot repeated the trick in the 800m freestyle on the second afternoon for her first medal career outside of the medley disciplines at the European Short Course Championships.
With the perceived slower heats taking place in the morning and those in the final needing to better those clocked to contend for medals, Miley did just that with a Scottish record of 8:15.66minutes.
However once again that was not quite good enough for victory as Danish two-time world long course champion Lotte Friis went over five seconds quicker than her to win gold in 8:10.24.
Friis and Miley were the only swimmers in the afternoon to better the best time posted in the morning though, meaning Willmott took bronze after clocking 8:18.90.
That represented the first major senior international medal of Willmott's career having competed at the Olympics, Commonwealth Games and European Championships over the past four years.
Elsewhere fellow Brit Lauren Quigley did herself proud in her first major senior international final, finishing seventh in the 100m backstroke medal showdown in 58.74seconds.
Ukraine's Daryna Zevina took gold in 57.07, coming from fourth at the halfway stage to demote Laure Manaudou into second and Simona Baumrtova into third.
Sophie Smith and Siobhan-Marie O'Connor ensured the good news for Britain's swimmers in France continued as both advanced out of the 100m medley semi-finals and into the final.
Drawn in the same semi-final, O'Connor, who ranked fourth to Smith's second in the heats, took victory in a new personal best time of 59.79 while her teammates effort of 1:00.47 equalled hers.
However both will have their work cut out to improve on their positions in the final with Hosszu qualifying as the quickest in 59.50 and Hungarian team-mate Zsuzsanna Jakabos the second fastest.
Earlier in the afternoon, Marco Loughran failed to progress to the 50m backstroke final as he ranked 10th overall, although his time of 24.07 was 0.03 shy of his own Welsh record.
Laszlo Cseh collected his second gold medal in as many days in the men's 400m medley while Denmark's Rikke Moeller Pedersen won the women's 200m breaststroke by over three seconds.
Italian Fabio Scozzoli led from start to finish to claim gold in the men's 100m breaststroke and in the women's 100m freestyle Veronika Popova edged out Jeanette Ottesen Gray for victory.
Russia enjoyed further success as Evgeny Korotyshkin came from behind to beat Rafael Munoz Perez by less than half a second in the men's 100m butterfly.
Meanwhile Ottesen Gray made up for her miss in the 100m freestyle by winning the 50m butterfly and Jeremy Stravius delighted the home crowd by claiming victory in the 50m backstroke.
And no sooner had Stravius left the pool than he was back in it to help France's mixed 4x50m medley relay team to gold over a second ahead of the quartet from Slovenia.