He wrote about his experiences in his book Land Marks and Sea Wings in 2005

"The indigenous birds showed no fear of us. Aldabra flightless rails came into the huts and even sampled cups of tea. Aldabra fodies – colourful sparrow-like birds – and the rare Aldabra kestrel nested in old buildings.

Young Frigatebird

Red-footed boobies nest in trees on the fringe of the lagoon, alongside frigatebirds. When roosting in the evening, they let their wings droop to conserve energy – strange shapes seen from a boat passing underneath...

At night the island is taken over by crabs of many kinds, cardisomas and the large tree-climbing robber crabs. Woe betide any creature lying injured and unable to move. Hermit crabs and fiddlers are out in the day. Large fruit bats cast eerie shadows over the beach in the moonlight.

The Milky Way and all the stars are magnificent. Being close to the equator, both the Southern Cross and the Plough were visible.

Indian Ocean AldabraSunsets were often spectacular – the sun flashing from orange to green in the second before it vanished below the horizon and darkness fell. Distant storm clouds added height to the dimensions of our flat world."

A lot has changed since 1974...

While Aldabra's status as a wildlife haven is now protected its geographic position means it is gathering much of the detritus of our modern world - tonnes of plastic ocean waste wash up on its shores contaminating the beaches.

The Aldabra Clean-Up Project aims to raise money to fund a clear up of the beaches, and to repurpose and recycle it. They are also campaigning against single use plastic items and will conduct research on the types and quantities of litter collected.  You can follow their progress (which Dad would have applauded) on twitter and Facebook.