One in four workers do not take all their holidays because of concerns including the cost of a break and "anxiety" over being away from the office, according to a new study.
One in 20 still had at least a week to take off at the end of the year, a survey of 2,000 adults by comparison website TravelSupermarket found.
The biggest issue is co-ordinating time off with a partner or other family members, but other considerations include cost and the effect on employers of taking a break.
Almost one in eight said they checked work-related emails or phone calls while they were on holiday, admitting it was almost impossible to switch off.
Bob Atkinson of TravelSupermarket said: "As hard as it may be, switching off your phone while you're away will not only make your holiday more enjoyable, it will make your companion or family's trip even better.
"There's nothing worse than holidaying with someone who is continually taking calls or responding to emails."