Britain's Prince William and his girl Kate Middleton are unlikely to turn engaged for at least 18 months.
William -- second in the line of succession to the British throne -- has been dating Middleton since tardy 2003, but due to the planning involved in a regal engagement, it's unlikely the pair will be getting married anytime soon.
A Royal Household source tells Britain's News of The World newspaper, "There is a lot of planning involved in a royal engagement announcement of a member of the family as senior as Prince William.
"A number of high-profile people have to be informed formally, and the twosome have to be introduced to the Prime Minister of the day among others. All this takes time.
"As far as I am aware I cannot see on that point being an engagement betwixt the Prince and Miss Middleton for at least 18 months."
The source also dismissed rumors -- which fuelled conjecture of an imminent declaration -- that the duo were adjust to meet PM Gordon Brown at Balmoral this weekend.
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