Fermanagh's Josh Elliott clinched a maiden victory in the National 1000cc Superstock series at Brands Hatch on Sunday.
The Morello Kawasaki rider held off Cheshire's Adam Jenkinson and South African Hudson Kennaugh.
Carrickfergus man Alastair Seeley had been leading but ran into mechanical trouble and finished in fifth place.
In the British Supersport events, Glenn Irwin was second in the sprint race and fourth in the feature race.
Irwin, also from Carrickfergus, now lies fourth in the standings on 62 points, 24 behind series leader Luke Stapleford.
Kyle Ryde won the sprint outing and Stapleford the feature event, with Jordanstown's Andy Reid failing to pick up any points after crashing unhurt in race one.
"I am delighted to take my first ever win in the Superstock 1000cc class," said Elliott who is the new leader of the Championship.
"I had a great race with Alastair Seeley. I led for the first part of the race and on lap eight he passed me.
"I felt comfortable sitting behind him and my game plan was just to let him set the pace. It left me time to work out where I was stronger and my plan was to pass him on the last lap.
"When I saw he had a problem, I took the opportunity to slip past and take my first win. It was bad luck for Alastair, but I am sure I'll see plenty of him this season."
There was disappointment for Michael Laverty in the Superbike class as the Toomebridge rider came home 13th in race one and 19th in race two to occupy 14th position in the championship for the Moneymore-based Tyco BMW team.