I'm guessing from the price that it's a B or L class ticket, rules here is
UNLESS OTHERWISE SPECIFIED CHANGES CHARGE GBP 50.00 FOR REISSUE/REVALIDATION. NOTE - CHANGES FOR OUTBOUND ONLY PERMITTED UP TO THE DAY BEFORE OUTBOUND DEPARTURE. CHANGES TO INBOUND ONLY PERMITTED UP TO THE DAY BEFORE INBOUND DEPARTURE. --- NO CHANGES OR UPGRADES PERMITTED ON DAY OF DEPARTURE. --- WAIVED FOR ILLNESS OR DEATH OF PASSENGER OR FAMILY MEMBER. WAIVER FOR ILLNESS ONLY APPLIES IN THE EVENT OF CERTIFIABLE HOSPITALISATION. --- MAY UPGRADE THE ENTIRE JOURNEY TO A HIGHER VS FARE AT CHARGE OF GBP 50.00 PER TRANSACTION. ANY DIFFERENCE IN FARE MUST BE COLLECTED. ORGINAL REFUND CONDITIONS APPLY TO ANY UPGRADED TICKET. --- CHARGES DO NOT APPLY TO INFANTS PAYING 10 PCT. OF THE ADULT FARE. CANCELLATIONS TICKET IS NON-REFUNDABLE IN CASE OF CANCEL/NO-SHOW/ REFUND. WAIVED FOR ILLNESS OR DEATH OF PASSENGER OR FAMILY MEMBER. NOTE - MAY BE USED AS CREDIT TOWARDS THE PURCHASE OF A HIGHER VS FARE CLASS WITH A PENALTY OF GBP50.00 THE FARE MUST BE RECALCULATED FROM THE POINT OF ORIGIN AND ANY DIFFERENCE COLLECTED. MIN/MAX STAY REQUIREMENTS AND ADVANCE PERIOD MUST BE ADHERED TO. IF THE NEW ITINERARY RESULTS IN A LOWER FARE THE GBP50 CHANGE WILL APPLY AND NO REFUND WILL BE MADE IN THE EVENT OF SUBSEQUENT CANCELLATION THE ORIGIN NON-REFUNDABLE AMOUNT WILL REMAIN NON-REFUNDABLE. MAY UPGRADE TO A HIGHER CABIN ON THE SAME FLIGHT AND DATE. ANY DIFFERENCE IN FARE MUST BE COLLECTED CHANGE FEE WILL NOT APPLY. CHARGES APPLY TO ADULTS AND CHILDREN ---- WAIVER FOR ILLNESS OF PASSENGER OR IMMEDIATE FAMILY MEMBER ONLY APPLIES IN THE EVENT OF CERTIFTABLE HOSPITALISATION. ---- WAIVER FOR DEATH OF PASSENGER OR IMMEDIATE FAMILY MEMBER APPLIES AS EVIDENCED BY A DEATH CERTIFICATE. ---- IN THE EVENT OF CANCELLATION OR FAILURE TO USE CONFIRMED SPACE AN MPD WILL NOT BE ISSUED FOR FURTHER TRANSPORTATION.
So unfortunately doesn't look cancellable - worth a try anyway I suppose! IIRC a cancellation on FC miles redemptions forfeit 25% of those spent.