MARLOW RFC had to work hard for the points after edging past High Wycombe RFC in South West 1 East on Saturday.
They won 25-20 and are now 18 points clear of their Bucks rivals after just eight matches.
Meanwhile, in National League 3 South West, Amersham powered to a valuable victory at Maidenhead.
They won 47-12 to record only their second league victory of the season.
It was also a good day for Beaconsfield, who ended their losing streak in conclusive style at Romford & Gidea Park.
They won 39-5 to register their first victory of London 1 Northat the eighth attempt.