Is This The UK Toughest Marathon?

The Cybi (k-u-b-y) Coastal Trail is undoubtably beautiful but is it the UKs Toughest Marathon. As a 4:20 marathon runner I had no idea how long this would take me to finish but with a strict 8 hour cut off I knew I was going to be a demanding course finish with the climb and decent of Cybi Mountain at 220m.