Swindon won away for the first time since September when they cruised to a 4-0 win at Chesterfield who crashed to a fourth straight defeat.

Nicky Ajose started and finished the rout with Louis Thompson and Jon Obika completing one of Swindon's best displays of the season.

Swindon started strongly and went ahead in the third minute when Ben Gladwin played Bradley Barry in on the right and his low cross was turned in by Ajose.

The visitors were moving the ball around confidently and another precise passing move ended with Thompson firing a low shot under Tommy Lee in the 15th minute.

Chesterfield created little until the 37th minute when Dan Jones volleyed over and Jay O'Shea struck the crossbar in the 43rd minute but Lee denied Obika a minute later.

Obika beat Lee three minutes after the interval when Gladwin set him up to score from the edge of the box and he wasted a great chance of a fourth before Lawrence Vigouroux denied Rai Simons.

Ajose scored his second in the 79th minute and only a sharp save from Lee denied Obika a fifth.