27/05/2026
Lock to Lock 4K Swim – June 14th 10K August 2nd
For over a decade, swimmers have returned year after year to these truly magical open water events. From the Lock to Lock 4K, to the epic 10K downstream marathon swim, and the brutal 20K SwimRun, these swims inspire dedication, challenge, and unforgettable experiences.
That dedication is matched by the same experienced team and organisers who have supported open water swimmers and swimming events across the UK for many years.
These are not overcrowded mass events — numbers are intentionally very limited, preserving the beauty, grace, and magic of each swim.
From our test results you can clearly see the low levels, way below the recommended excellent 500 cfu’s per 100ml for E-coli and Intestinal Enterococci.
