Winchester are within two points of climbing into a top five South League Premier Division One spot after a narrow 3-2 win at basement side Henley.
Jack Culmer, Ben Hibberd, and South African Todd Hutcheson hit the target alongside the River Thames.
Former Southampton hit-man Ollie Knight took his season's tally to 18 by scoring twice as London Edwardians beat Milton Keynes 5-2.
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