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Ask P&O this question or speak to you local travel agent.
The brochure isnt out yet as I am planning to do the sector from sydney to cape town. Phone P AND O and ask for a first edition brochure as I have which I think is issued on Dec 1st 2007.
Its not usual to get on in Tenerife, you usually embark in major cities, ie southampton, cape town, mumbai, sydney etc, but a phone call to the company will anwer your question.