'Side went ahead on 22 minutes through Reece Simpson, before an unfortunate own goal from the midfielder levelled the scores on 36 minutes.
James Peagram put 'Side back into the lead a minute before half-time, with Martin Rodriguez sealing victory on 74 minutes.
The win leaves the Sky Blues 10th in the league table.
'Side are next in action in the FA Vase when they face fellow Thurlow Nunn First Division South (Eastern Senior League) outfit Cornard United away on Saturday 25th September.
That Second Round Qualifying tie will kick off at 3pm.