I'm reasonably local to this area and would second the advice to use the train. Yes, you would be driving in the rush hour. Even out of term-time, the M1 is subject to unforeseen delays. It is sufficiently crowded for any quite minor incident to have a disproportionate effect. Even on a "good" day, Jct 10 to 9 will probably be slow, and again Jct 6 to 5.
The journey by train would be shuttle bus from the airport to Luton Airport Parkway station, First Capital Connect train to Mill Hill Broadway (you may have to change at St Albans), bus 221/240 to Edgware. About 54 mins, according to the TfL website.
Alternatively, if you drive, leave earlier if you can; if you're driving someone to the airport that should be possible. If you're arriving by plane that won't be possible, but leaving later (say, around 9:00, if by any chance (!) your flight is delayed) will actually mean the traffic will be significantly lighter.
Edited by FP on 10/06/2013 at 13:08
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