Wealdstone put their recent shaky form to one side to re-establish their seven point lead at the top.
After two defeats, they were once again too strong at home.
Bradley Quinton can be proud of his new Welling United side’s efforts but a goal from Michee Efete was enough for the leaders to earn a 1-0 win.
Havant have games in hand at the top and their unbeaten away run goes on.
The Hawks triumphed 2-1 at Hemel Hempstead, who have fallen off the pace in recent weeks.
Goals from Sam Magri and Danny Kedwell proved to be enough - the veteran striker’s winner hurting former Wimbledon team-mate Sammy Moore, in charge at Vauxhall Road.
Dartford’s great run goes on - they have not been victorious in five of their last six games.
Darren McQueen, Jacob Berkeley-Agyepong and Luke Wanadio scored the goals as Steve King’s side were too good for Oxford City. It ended 3-0 to the hosts at Princes Park.
Tonbridge secured a huge three points and pulled There may have been Braintree Town into the mire in the process.
Angels’ 1-0 win at Cressing Road came thanks to an own goal - Steve McKimm’s men are now four point clear of trouble.
St Albans picked up what could turn out to be a precious point in a thriller at Eastbourne.
James Kaloczi made it 3-3 at the death as the Saints came on strong late on.
It may need to be the play-offs for Slough Town as Billericay’s undefeated home record goes on.
The 2-2 draw in Essex came after George Wells thought he had won it for the Rebels. Blues’ Ronnie Henry rescued a point late on.
Jake McCarty pinched a point for Weymouth in their 1-1 draw with in-form Dulwich Hamlet.
National League South scores:
Billericay 2-2 Slough Town
Braintree Town 2-2 Slough Town
Dartford 3-0 Oxford City
Eastbourne 3-3 St Albans City
Hemel H 1-2 Havant & W
Wealdstone 1-0 Welling United
Weymouth 1-1 Dulwich Hamlet