Hashim Amla hit Liam Dawson straight down the ground for the only six in his 180-ball knock worth 87.

Elgar continued from where he left off on the second day and 135 runs in partnership with Amla.

Elgar was the first wicket to fall in the day as Ben Stokes had him caught by James Anderon on 80.

Anderson struck soon after to take out Quinton de Kock for 1.

When the on-field umpiried turned down an LBW appeal, Dawson opted for a review to send Amla back to the hut 13 short of a hundred.

Faf du Plessis helped South Africa stretch their lead past 300.

Faf du Plessis fell soon after his fifty, but not before taking South Africa's least past 350.

Philander hit a couple of big ones while contributing a useful 42 to South Africa's lead.

Moeen Ali finished with a four-fer, accounting for the South Africa tail-enders.

Morne Morkel hit three boundaries in his 17 with the bat.

Morkel had Cook lbw off the first ball but the former English skipper escaped with a successful review.