Yes, the majority of hotel reservations are fully refundable provided that you cancel prior to the hotel's cancellation deadline, which often is within 24-48 hours of your scheduled arrival. If you have a reservation that's non-refundable, you might still have the option to cancel and be given a refund within 24 hours of booking. Enter dates in and click on "Search", then use the "fully refundable" filter to get the best deals available near Porthcurno Telegraph Museum.