Ingram had the medium tyre fitted on his Excelr8 Motorsport Hyundai i30 N, and started from seventh on the grid.
He made short work of the five hard-shod cars in front of him to move up to second on lap two, and set off after the leading Motorbase Performance Ford Focus ST of Dan Rowbottom.
Rowbottom was also on mediums, and passed polesitter Stephen Jelley’s West Surrey Racing BMW 330e M Sport on the second lap at Williams, with Ingram following him past on the back straight.
Ingram was soon on the back of Rowbottom, and on the fifth lap the leading Ford defended into Riches, only to run wide and allow Ingram to slip through into the lead.
Rory Butcher, who was the leading starter on soft tyres from eighth on the grid, also got past Rowbottom into the esses.
The Scot’s Speedworks Motorsport Toyota Corolla was now 1.306 seconds behind Ingram, and despite the apparent tyre advantage he could not erode the deficit.
Instead, Cammish became a looming threat in his Motorbase Ford.
Cammish got up to third on lap seven of 11 when Rowbottom ran wide at Oggies, and on the ninth lap he got past Butcher into second place at Riches.
With two laps remaining, Cammish, who had set fastest lap in his climb from 11th on the grid, was 1.558s adrift of Ingram.
Source: Autosport