The Duke and Duchess of Cambridge – the Prince and Kate Middleton's new titles – revealed they would not be immediately travelling overseas for the traditional post-wedding break, choosing instead to spend time at an undisclosed location in the UK before the Prince returns to work next week.
The sudden change, announced on Saturday, came despite aides having said consistently that the honeymoon would immediately follow the wedding, and Miss Middleton shopping for sundresses and bikinis last week.
There was speculation it may have been prompted by security concerns.

http://www.telegraph.co.uk/news/uknews/royal-wedding/8485790/Royal-wedding-security-fears-hit-Prince-William-and-Kate-Middletons-honeymoon-plan.html