Long Sutton 1st failed to find the top gear of recent performances as they went down to a 3-1 home defeat against Waltham Forest in Premier B on Saturday.
After conceding early on, Sutton did equalise before the break through good work from Sisson.
In the second half the home team dominated but were hit twice on the break and suffered the agony of the normally reliant Harrison striking the post from a penalty stroke.
No such problems for top-of-the-table Spalding 1st, however, as they brushed aside third-placed Ipswich 2nd 5-0 in Division 2N.
Salvatore Cunnington unleashed an absolute screamer into the top corner from the edge of the D to put Spalding ahead and they doubled their lead when Tom Wilson rounded the last defender and clinically finished on his reverse.
After the break, Josh Rowbottom skilfully deflected in the third from a penalty corner, Russ Watts grabbed the fourth and Callum Clarkewrapped up the victory.
Title rivals met in Division 3NW, where Long Sutton 2nd were thrashed 5-1 at March 1st.
Sutton conceded early on but were level at the break after good work from man of the match Ross Gavaghan and Jeremy Watt released Ben Shore who rifled home.
Sutton battled in the second half as March upped their game, but they could not stop the home side scoring four more.
Spalding 2nd stay top of Division 4NW after a 3-0 victory at Bourne/Deeping 3rd.
Against a normally tight defence, the goals came from Joe Higgins, Rob Dalton and Glenn Perkins.
Long Sutton 3rd beat Bourne/Deeping 4th 7-3 in Division 5NW.
Sutton led 4-1 at the break, with Gary Hales scoring them all. Edward White scored the goal of the game in the second half and James Baker added a sixth before an own goal sealed the victory.
Second placed Spalding 3rd also netted seven and conceded just two against third placed Newmarket 2nd in Division 5NW.
It was only 2-1 at half time after goals from Tom Shinkins and Peter Gray but after the break Spalding came out all guns blazing.
Shinkins completed his hat-trick and also among the goals were Darren Gooby (2) and Rob Tilbrook.
Spalding 4th suffered a narrow defeat, 3-2 at Horncastle 2nd, in Division 6NW (N).
It was derby day in the same division, where Spalding 5th thumped Long Sutton 4th 4-0.
Sutton’s youngsters came up short in this enjoyable game against a classy Spalding outfit.
A sweet short corner strike from Ed Sly broke the deadlock as Spalding went 1-0 up into the break,
The second half saw Spalding gradually tighten their grip on the game and Mark Smith-Hughes made it two after excellent work by David Dorey.
Dominic Ibrahim tucked home number three and Mark Smith-Hughes added a fourth minutes from time.