UPDATE 1-Cricket-Collingwood and Trott lead England to victory

* Collingwood hits unbeaten 105 and Trott adds 87

* South Africa go one down in one-day series

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By Ken Borland

CENTURION, South Africa, Nov 22 (Reuters) - Paul Collingwood marked his record 171st one-day appearance with an unbeaten century to lead England to a commanding seven-wicket victory over South Africa in the second match of the series on Sunday.

The all-rounder scored 105 not out as England reached their target of 251 with four overs to spare to take a 1-0 lead in the five-match contest after the first game in Johannesburg was washed out by rain on Friday.

England slipped to 45 for two but Collingwood led the recovery with his fifth ODI century, off 108 deliveries with seven fours and two sixes.

Opener Jonathan Trott, continuing his excellent start to the tour, also played with calm assurance as he hit 87 off 119 balls with eight fours.