I have been searching for the answer to this and having been unsuccessful am now seeking help - please be gentle!

DW and I would like to take a trip to England over Thanksgiving in 2011 using airmiles. Based on experience, is the best time to book when the flights become available for booking (ie at 330 days) or is there an optimum time to book.

We're going from DTW and happy to land at LGA, LHR or MAN. All advice gratefully received.

Thanks.