Prince William has booked a surprise romantic mini-break for wife Kate and is whisking her off to a Swiss chalet. After six weeks away from the Duchess of Cambridge flying an RAF helicopter in the Falklands, Wills told her: “Pack your thermals, darling.” The royal couple, who were reunited earlier this week, are staying in the posh ski resort of Verbier. A source said yesterday: “William missed Kate terribly when he was away. They spent Valentine's Day apart and he has been thinking for some time how to make it up to his wife. “He wants a reunion in the most romantic possible fashion. “They've had some brilliant times skiing, and William decided a getaway in Switzerland, where they can wear goggles and hats and go around unnoticed, would be perfect. “Kate was delighted when he eventually told her about his plans and cannot wait for the pair to spend some quality time together.” Wills and Kate were first pictured skiing together in Switzerland in 2004 and two years later, in the same resort of Klosters, they kissed publicly for the first time. Last year, William and Kate were reported to have cancelled a planned ski trip over fears it would not be “appropriate” in recession-hit times. The couple, who married last April, shared an emotional reunion at RAF Brize Norton in Oxfordshire on Wednesday following the 29-year-old prince's six-week tour of duty. Prince William, who is a Sea King helicopter pilot, had been on deployment in the South Atlantic with his search and rescue crew. While he was away, the duchess, 30, admitted she had been missing her husband “desperately”.