Home tutoring is nothing new, and many tuition firms also offer extra tutoring services to families wanting their children to have a little extra help learning ahead of entrance exams at competitive private schools in the U.K., such as Harrow, St. Pauls or Eton.
But Spriggs said his tuition firm was receiving fewer requests for just a few extra hours of tuition here and there and more for full-time tutors that, essentially, become other members of the richest household's retinue of staff.
"We always make it clear to parents that we will only offer full-time home schooling for a year though," he explained to CNBC.
"Any more than a year and children start to lose out on what a school environment can give them, such as social skills and that vital interaction they need – although we try to mitigate that anyway in our home tutoring with sports clubs of museum trips as part of the teaching program."
Spriggs would not reveal the salary region of tutors, who he described as among the best in London, if not Europe, but did say that the costs of hiring a full-time tutor would exceed the fees of a top boarding school, which usually charge around £35,000 ($54,400) a year.
Some families employ two full-time tutors, one to cover humanities and the other to cover science and maths. Devising an educational plan for youngsters in these situations is not a quick process, however, taking up to six weeks to plan, Spriggs said, with a tutor being matched to the child to ensure they are compatible.
One such residential tutor is Phineas Pett, who has travelled the world for his work. His longest residential tutoring stint was seven weeks on a family yacht in which he had to work eight hours a day for seven days a week. "The parents wanted their children to get into a certain school and desperately wanted their children to get into the British education system," Pett said, explaining the arduous hours and desire for tutors abroad.
"There's usually a certain goal in mind- such as the entrance to a certain school – and maybe the schools in the child's home country aren't up to scratch on certain subjects so a residential tutor is called in to provide weekend tutoring or after-school tutoring," Pett said.