Marella's passengers are almost exclusively from the U.K., with everything onboard geared to British tastes, from food and drink to stand-up and pub quizzes. Most are over 50, but the age range comes down considerably in the school holidays when competitive pricing and convenient flights from local airports, as well as free kids' clubs, make Marella attractive to families. However, a handful of the line's ships are adults-only and draw an older crowd.

Not too much. The dress code is casual apart from one dress-to-impress night per seven-day cruise, which can be interpreted as you wish. Tuxedos and ball gowns are a rarity and, in fact, would seem out of place, but people do make an effort on these nights to dress it up.

Not quite. Marella's cruises are fairly inclusive with gratuities and basic drinks included. Meals in select venues are also included. Extra costs include an upgrade to premium wine and spirits, bottled water and specialty coffee, spa treatments, shore excursions and specialty dining.

Marella's ships are packed with activities, which is just how Marella cruisers want it. Among the more popular activities are poolside contests, lively evening entertainment and, on ships that have them, virtual reality games, escape rooms, climbing walls and mini-golf.

Best for: Younger Brits looking for a friendly, activity-packed cruise; families

Not for: Luxury cruisers and culture vultures