When this bird (attached) approached the boat yesterday, I immediately shouted "possible Grey-headed Albatross". The bird looked overall very different from BBAL or CAAL.
Following characters speak for GHAL:
- grey head with whiter cheek
- contrasting white lower eye-lid
- and, importantly, the facial expression that is very dissimilar to that of a BBAL/CAAL
Not so sure about colour and shape of bill.
Nevertheless I think that this is a genuine GHAL.