Two second half goals from Romford old boy Chinedu McKenzie won this game for the hosts after Boro had led at the interval.
Tonbridge fielded ten of the starting line up from their last National League South game, but it wasn't until the closing stages that they seemed able to impose themselves on Boro, who were the better side for long periods. Meanwhile Romford had new boy Ethan Kessell on the bench, and included Luke McLeavy - who made four appearances in Blue & Gold in 2014-15 - alongside Michael Agboola in central defence.
Neither goalkeeper was unduly troubled in the early stages, but Romford went ahead after 32 minutes with a well worked goal. George Woodward's free-kick was headed back across goal by McLeavy and Jay Nash stooped to head home.
Romford had two good chances to extend their lead shortly after the break. Henly in the home goal pushed a shot from Timi Babalola wide of the post, and from the resulting corner, Michael Agboola's header was cleared from the foot of the post. Jack Riddell then made a good save to deny Tonbridge an equaliser from a good header, but almost immediately Jimmy Cox headed against a post from George Woodward's cross.
Tonbridge stepped up a gear in the closing stages, and Chinedu McKenzie rounded Riddell to put the home side level with fifteen minutes remaining, before giving the home side a win they scarcely deserved when he scored from close range after 86 minutes.
After two weeks without a game, this was a good workout for Romford who more than matched their hosts for long periods.
Romford: Jack Riddell, Charlie Little, Giovanni Palmer (Ethan Kessell), Luke McLeavy, Michael Agboola (Danny Nesbitt), Danny Cossington, George Woodward (Malaki Toussaint), Philip Brown-Bampoe, Timi Babalola, Jay Nash (Jimmy Cox), Malaki Toussaint (Anastasios Antoniou).
Note: Malaki Toussaint was replaced by Anastasios Antoniou, but then replaced George Woodward.