Hike 30K Challenge: Lewes to Seaford with Seven Sisters Views

Large Group Social Hike – one of Outdooraholics' bigger, more sociable hikes (prefer a smaller group? See their standard-size hikes). Key info: Distance 19 miles (30km); Grading: Challenging; Ascent: 690m; Hiking time: 7 to 8 hours; Cost: £33 (includes guided hike + return train). Payments are non-refundable and non-transferable, but a refund is issued if your place is rebooked via their resale process. Toilet breaks on the train, mid-morning, then nature stops, and at the end pub. Meeting point: London Victoria station, between WHSmith (no 34) and Nero Express (no 29).