Hardly a concern in a light single, but bear in mind from the NAT MNPS ops manual:
"Solely when flying in the Shanwick OCA, pilots of aircraft which are Satellite Communications (SATCOM) equipped, who have experienced total HF failure and are unable to relay by any other means, may, as a last resort, make contact with the Shanwick HF aeradio station at Ballygirreen on the special SATCOM number shown in the UK AIP and AIP Ireland for that purpose."