The biggest hotel guest faux pas have been revealed - including jumping the breakfast buffet queue, washing undergarments in kettles and stealing from rooms. Other frowned upon acts include reserving pool chairs with towels for long periods, leaving rooms excessively messy and being loud in the hallways late at night.

Smoking or vaping in hotel rooms is also considered a no-no, as are putting the incorrect number of guests on the reservation and leaving alarms or phones to ring without turning them off. While not reading reviews when booking and not collecting or cashing in rewards points are also viewed unfavourably.

In response, Hotels.com, which commissioned the research, is offering holidaymakers £100 in ‘Hotels.comCash’ for future trips after staying for 10 eligible nights through its rewards programme.

Melanie Fish, travel expert and spokesperson for the global marketplace, which has also teamed up with William Hanson for a ‘Grand Etiquette Hotel’ guide, said: “Small tweaks can make a world of a difference.

“Taking the time to check reviews or making the most of rewards can turn a good trip into a great one, and help your travel budget stretch further, too.”

Researchers found the vast majority (90%) consider themselves to be considerate guests - although 39% think residents have become less respectful in recent years.

Other divisive acts include hanging damp laundry on the balcony, not leaving a review after staying and being rude to staff. Sneaking extra guests in and constant public displays of affection around the pool are also frowned upon by hotel guests.

Those polled were also asked which nationalities they consider to be the gold standard for politeness – and which ones they perceive to be rudest.

Japanese tourists came top for being the most considerate, followed by Sweden in second place, with U.K. respondents placing themselves third.

At the other end of the scale, Americans are regarded as the most impolite, just beneath those from Germany, according to Hotels.com research conducted through OnePoll.

William Hanson said: “Better hotel etiquette doesn’t just benefit others, it can directly enhance your own stay.

“At the heart of my guide is the idea that small, thoughtful behaviours add up to big rewards: from a better night’s sleep and improved service to savings on future trips.”