Chiltern Hills AONB · Hertfordshire
Chess Valley & The Cricketers Circular, Sarratt.
The standout. Drops from Sarratt village green down to the River Chess — one of only ~200 chalk streams in the world — through water meadows and watercress beds, then climbs gently back up via Sarratt Church End. Working farmland with intermittent livestock so leads through the field stretches; a few stiles and kissing gates, otherwise wide path-and-track underfoot. Le Carré used Sarratt as the fictional MI6 training school — small literary bonus if anyone's read Tinker Tailor.
Post-walk: The Cricketers on the green, where the loop starts and ends — 4.4★ on 1,074 reviews, dog-friendly bar, garden out onto the green, Sun 11:00–22:30. If they're full, The Boot two doors down is 4.5★/1,036 and opens 9:30 for breakfast. Both independent.
AllTrails · The Cricketers · The Boot · Map