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If you really must have total support, the easiest method is to use a flowing grout.
Cementitious is cheapest, but make certain you buy dual phase expansion. (Most of the better brands are).
You'll need to build a (dismantleable) box to contain the grout. You could even cast in place M8 studding and just use two nuts above the post bases.
mespilus
@ffm
I need to fix some metal post bases to some flagstones (which are the copings of a stone wall). I've settled on using m8 concrete screws, since rawlplugs just weren't up to the job. Awkwardly the flagstones are angled to one side of the wall to help water run off. What's the best thing to use as a shim underneath them to make the post base vertical? Beveled washers are quite pricey and, ideally, I'd like to support the whole are of the post base (roughly 150 x 100mm). Is there anything easily available or easy to fabricate?