The friends he was holidaying with last heard from him at around 8.30am that day.
He told them he planned to walk back to his accommodation after missing a bus – a journey of around 11 hours by foot.
The search currently centres on Masca, a mountainous area on the western tip of the island.
The village, which is home to around 90 inhabitants, lies at an altitude of 650m, and is where Mr Slater is believed to have been when he was last heard from.
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