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Libby and Seb Key are a brother and sister from Sherborne in Dorset. At 11 weeks old Libby had a brain tumour removed, she and her family were supported by the charity Children With Cancer UK.

Now that they've grown up, they're each determined to support families who find themselves in a similar position. For Libby that meant becoming an early years practitioner, and for Seb it meant running the circumference of Iceland.

He completed the 786-mile journey in just 17 days, determined to raise money for Children With Cancer UK.

Libby and Seb spoke to Radio Solent's Steve Harris from Iceland, still recovering from the task's completion.