The company now have over a century and a half of experience in providing their passengers with an unforgettable holiday on the best vessels available. P&O have always been at the forefront of cruising by regularly updating their fleet with the latest in maritime design and technology. Their oldest ship, the Artemis, was launched in 1984, and is due to leave the fleet when P&O's newest acquisition, the Adonia comes into service in 2011.

The fleet is comprised of four ships that cater for passengers from all age groups, plus two that do not carry children - the Arcadia and the Artemis. For those passengers who prefer to be in a more adult environment, where the emphasis is on tranquillity, these two ships are the perfect answer.

The Artemis, at 44,348 tons, is the smallest of the fleet, but she has lived up to the saying that all the best things come in small packages. With a capacity of 494 cabins, two restaurants, four bars and one theatre/show lounge spread over eight passenger decks she is perfection in miniature.

The Adonia will join the P&O fleet in June 2011, and like her predecessor she will be child passenger free and also small enough to access ports that are impossible for the larger ships to enter, allowing a more off the beaten track itinerary. There will be 355 cabins, 75% of which will have their own private balconies. The friendly on board atmosphere, which Artemis passengers have appreciated so much, will still be there with improvements such as a dance floor and a large library.

Artemis passengers who have booked cruise holidays on the ship year after year will be very satisfied with the new vessel, and many will have already booked their places on the Adonia's maiden voyage.

P&aO's other adults' only ship is the Arcadia, the epitome of quiet stylishness - some might say pure indulgence. From the exterior glass lifts with their breathtaking views of the sea, to the 3,000 pieces of British artwork on show around the public areas, everything about the Arcadia is unusual and luxurious. Fine dining is high on the list of essentials, with a restaurant, the Arcadian Rhodes, created by the renowned British chef, Gary Rhodes. There is also an oriental restaurant, the Orchid, an Italian style trattoria and a poolside grill as well as a large main restaurant.

Apart from eating there are many more on board activities than are on the Artemis, as the Arcadia is a much bigger ship. One popular attraction is the spa with a thermal suite and hydrotherapy - a great place to relax after a long day's shore excursion.

With the small but intimate Adonia and the larger, more upmarket Arcadia , passengers wanting an adults only cruise will find something to meet their holiday requirements on one of these fine ships