Alison Gordon and Liz Ashbourne raced in the Masters women's quad in composite crews, winning their heats then racing against each other where Alison's crew made up of Castle Semple and Lomand scullers beat the Lakeland boat.
Zak Lee Green bravely front-loaded his B final in the lightweight men's singles, leading through 500m before finishing fourth for 10th overall, two thirds of a length up on the Czech sculler, in 7.04.95.
Peter Harper, Twin-Star's co-president and chief financial officer, Marc Sculler, its co-president, and Andy Bandremer, its executive vice president, will continue to oversee daily operations of the company.
And while Thornley, from Holt near Wrexham, wants to be 'in the top boat' for Rio, Watkins' return to the sport after the Welsh sculler partnered Grainger to sixth place in this year's world championships has ramped up the competition.
Wales cap Graeme Thomas stormed home second in a dramatic men's singles final after Olympic medal sculler Alan Campbell was disqualified for jumping the start.
Olympic 8s finalist Vicky Thornley from Wrexham beat Nottingham's Laura Wheeler by 2L to set up a semi-final Princess Royal singles clash with New Zealand world bronze medal sculler Emma Twigg.
The 29 year-old single sculler, from Mold, will test himself against more than 70 of the UK's top male lightweight rowers at the 5,000 metre water trial.
Single sculler Katherine Grainger and the lightweight men's double scull of Paul Mattick and Rob Williams looked stronger in qualifying than three weeks ago in Munich.
Single sculler Alan Campbell, double scullers Stephen Rowbotham and Matt Wells and the men's four took silver medals while the lightweight men's double of Zac Purchase and Mark Hunter took bronze.
Peter Daalder of Daly Plastics BV in the Netherlands and Jacques Musa of Sculler in France summarized trading conditions in some of the key European markets.