A century by John McLean gave Henley a seven-wicket victory over West Herts and kept them in touch with the leaders.
West Herts battled hard to reach 208, being bowled out in the 64th over.
Henley lost three early wickets in reply before McLean was joined in an unbroken century stand for the fourth wicket by Andy White.
McLean reached his century just before victory was secured to finish on 100 not out, while White was unbeaten on 51.
High Wycombe, Slough and Henley, have now opened up a gap between them and the rest.
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