Banbury started the brighter of the two sides, and in the first minute a Ryan Howell was just pushed around the post by James Warrington for a corner.
Though Banbury had the better of the early play, it was Slough who should have taken the lead after a quarter of an hour. Steve Sinclair was played in with only Andy Kemp to beat, but put his shot wide in one of Slough's few opportunities of the first half.
Just a minute later, Banbury had a good chance when a deep cross from the left by Glenn Walker found the head of the onrushing Ollie Stanbridge, but he put his header off-target.
Instead it was Simeon Williams who put the home side ahead on 39 minutes. After Stuart Swift was caught in possession, Walker played the ball through to Williams who slotted home across Warrington.
Slough, though, equalised a minute before half time. Sean Sonner latched on to Steve Sinclair's cross six yards from goal, and flicked his header beyond a stranded Kemp.
Banbury almost responded immediately as Howell worked his way through a scrambling Slough defence only to fire his shot high from close range.
Dan Burnell had the last opportunity of half and could have given Slough the lead. Warrington's long clearance in true route one fashion landed at the feet of Burnell who, with just Kemp to beat, attempted to lob the 'keeper but his shot landed just wide.
Slough started the second half the better of the two sides and used this impetus to take the lead and dominate the half.
Good work down the right hand side saw Coyne pick out Sinclair in space on the right hand edge of Banbury's area with a line ball. Sinclair's resulting cross-come-shot looped over a helpless Kemp.
Burnell could have increased Slough's lead further after a penalty was awarded in the 65th minute for shirt pulling in the area. But the striker's effort was tipped onto the inside of the post superbly by Andy Kemp, the rebound missing the feet of onrushing Slough players.
At this point Banbury were only reduced to firing shots from range, barely testing Warrington in goal, with Slough's defensive line being marshalled excellently by Woozley and Bowden-Hasse.
Increasing their pressure on the Slough goal in an effort to find a way back into the game, Banbury were caught on the break in the 88th minute.
Following a series of Banbury corners, Slough broke and with Banbury short on numbers at the back, substitute Ben Abbey was played clean through 25 yards from goal, and rounded Kemp before slotting home into an empty net to seal his side's progress.
Slough Town Line Up
- 1 James Warrington
- 2 Simon Sweeney
- 3 Danny Murphy
- 4 Adam Martin 16
- 5 Nathan Bowden-Haase
- 6 David Woozley
- 7 Steve Sinclair
- 8 Paul Coyne
- 9 Danny Burnell 15
- 10 Sean Sonner 14
- 11 Stuart Swift
Banbury United Line up
Andy Kemp, Simeon Williams, Ollie Stanbridge (Ben Polk), Ben Thackeray, Tommy Kinch, Martin Hutchcox, Sam Youngs (Nick Kingston), Ryan Howell, Will Green (Courtney Herbert), Aaron Woodley, Glenn Walker. Unused Subs: Danny Edmond, Ady Fuller