More than 300 people took part in an annual sponsored walk, raising £2,000 for the Paul Strickland Scanner Centre in Northwood.
On Monday participants in the Chenies Spring Walk set off and finished at Chenies Manor, with a free entry to its famous Tulips Gardens.
The route follows the Chiltern Trail through Chenies, Latimer and Sarratt, with breath-taking views of the Chess Valley, River Chess, and woods covered in bluebells.
Paul Strickland Scanner Centre is based in Mount Vernon, and provides scanning services for the diagnosis of cancer and other diseases.
The independent medical charity needs more than £1 million a year to run and also to fund new technology.
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