Pop diva Whitney Houston has been forced to postpone several dates from her upcoming European tour, her first time in the UK in more than eleven years. Already having postponed yesterday's scheduled appearance in Paris, Sony announced yesterday that Houston would have to reschedule her shows in Manchester and Glasgow, Scotland. The Glasgow show has been rescheduled for May 1st and the 2 Manchester shows will be made up at the tour's end, on June 16th and 17th.