England's Alastair Cook (left) bats as South Africa's Quinton de Kock looks on during the third day of the first Test match at Lord's Cricket Ground in central London.
London: Alastair Cook's unbeaten fifty strengthened England's grip on the first Test at Lord's after South Africa had to toil in the field without Vernon Philander.
England were 119 for one in their second innings at stumps on the third day, a lead of 216 runs in this opening match of a four-Test series.
Former captain Cook was 59 not out, after more than three hours of typically painstaking effort, with fellow left-hander Gary Ballance unbeaten on 22.
Experienced paceman Philander did not bowl a single one of the 51 overs the Proteas sent down Saturday, after going for an X-ray on a hand injury suffered when he was hit by James Anderson while making 52 in South Africa's first innings earlier in the day.
It was a worrying absence for the Proteas given they are already without Kagiso Rabada, another member of their pace attack, for next week's second Test at Trent Bridge after he was banned for verbally abusing England all-rounder Ben Stokes on Thursday's first day at Lord's.
South Africa, with Dean Elgar leading the side for the first time in the absence of Faf du Plessis on paternity leave, wasted their two reviews in the first 80 overs on Cook.
Both times they challenged what seemed, even with the naked eye, sound not out decisions by umpires Paul Reiffel and S Ravi in response to lbw appeals.
But Cook was still on his tea score of 31 when partly unsighted wicket-keeper Quinton de Kock missed a stumping chance off left-arm spinner Keshav Maharaj.
Keaton Jennings, born in South Africa but England qualified through his mother and residence, helped Cook put on 80 for the first wicket.
But he fell for 33 when, trying to cut a Morne Morkel ball that was too close to him, he was caught behind by de Kock -- who played in the same XI as Jennings when they were both pupils at Johannesburg's King Edward VII school.
Cook's three on another sun-drenched day at Lord's saw him to a 127-ball fifty including eight fours of which a cover-drive off Maharaj was the pick.
South Africa resumed on 214 for five -- still 244 runs behind England's first innings 458
Temba Bavuma was 48 not out and nightwatchman Rabada unbeaten on nine.
Both Rabada (27) and Bavuma (59) fell to spinners Liam Dawson and Ali respectively.
But after Root took the new ball, de Kock twice struck fast-medium bowler Broad for three successive fours -- the best a whipped drive through mid-on from a ball pitching outside off stump.
