Thanks useful information: 
Not really. It's not just a matter of increasing the image size, but doing any appropriate PP
(sharpening, etc) that the change might require. IMO, the image size from your camera would be
sufficient (all else being equal) to produce poster-size (whatever that is) prints. As I said, unless
they really want that size, even half the native pixel size would do - if file size is an issue with the
printer firm.
>>Additional: I would not up-sample any images you've already down-sampled. Instead, work on
the originals again, doing whatever you did before, then save a version for printing. That can be
either at the same size, or re-sampled to, say, half normal size. <<
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