Even so, as a measure of the pace up front, more than a second splits Checa in fourth to Sylvain Guintoli in fifth, the Frenchman nonetheless going well to stave off Marco Melandri in sixth and Michel Fabrizio in seventh.
Noriyuki Haga might have fancied his chances of the front row after showing good pace in SP1 and SP2, but a crash at Brooklands would consign him to eighth position.
Haga wasn't the only Aprilia rider to hit the deck during Superpole, with title challenger Max Biaggi enduring an untypically difficult afternoon. Having struggled in the sessions preceding Superpole, Biaggi would also crash at Brooklands early on in SP1.
Though he got back on circuit to qualify for SP2, he wouldn't go any higher than 11th, the first time Biaggi has qualified outside the top ten since Assen 2010.
He starts behind Leon Haslam and Ayrton Badovini, the BMW riders just missing out on a top eight berth, while Mark Aitchison produced another stellar Superpole performance to grab 12th position and top Kawasaki status.
Aitchison's cause was aided by the absence of Tom Sykes, who crashed heavily during FP2 and was ruled out of Superpole. Reportedly suffering concussion, it hasn't been confirmed whether he will skip the races, for which he would start 16th behind Jakub Smrz, James Toseland and Maxime Berger, the latter two riders unable to carry their practice pace into Superpole.