Sorry about that - I inadvertently hit the return key...

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I found BOS-LHR in M for under $600 for a quick weekend trip. This is by no means cheap, but I am willing to pay this price knowing that I only have to fly 3 times and get the 30K bonus. Time is worth something to me.
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What I intended to say was that this may not be too good a deal. Tickets from BOS-LHR are usually around $400 during the winter. That would be a total of $600 for the 30K bonus miles.