Quite apart from the failure to call as scheduled at Madagascar let's look at the case of Mayotte. We booked a cruise that featured Mayotte, and it was only when we boarded the Europa that we found that it had vanished from the itinerary.
In other words, our contract included Mayotte and we were not informed of its removal from the itinerary.
Here's what UK law says:
Significant alterations to essential terms
- (a) where the organiser is constrained before the departure to alter significantly an essential term of the contract, such as the price (so far as regulation 11 permits him to do so), he will notify the consumer as quickly as possible in order to enable him to take appropriate decisions and in particular to withdraw from the contract without penalty or to accept a rider to the contract specifying the alterations made and their impact on the price; and
- (b) the consumer will inform the organiser or the retailer of his decision as soon as possible.
The rest of this Statutory Instrument can be referred to at: http://www.opsi.gov.uk/SI/si1992/Uksi_19923288_en_1.htm