Tri X with Rodinal because it will never go bad on me and it produces lovely sharp grain and with Tri X negatives that will really zing.
I choose Tri X because faster films are lower in contrast than slow or medium films therefore in the bright sunny conditions of Mr Callows Tropical Island contrast would be less of a problem. On the odd dull day I could push the development.

Plain Hypo Fix.

Paper Ilford Warmtone and Kodak Ektalure

Paper dev Zone VI and Ethol LPD.

Can I have a small computer?.................only kidding guys..... before I get myself banished. It's the wacky Brit sense of humour.