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Series in Bargain Hunt speak are literally just the production runs - usually things done in the same day appear in the same series ultimately, just not necessarily in order, or with any particular rhyme or reason as far as I can tell.

The BBC's policy is new material and rolling repeats, so the repeats on a given day are so many episodes away from the new setup, but it might be on one day that it's 3 series back, one day it's 4 and so on. It's a reasonably clever way of spreading things out without making it too obvious, but yes, it does mean that they lean towards the more recent than the older shows (none are shown with the old ruleset, for example).

I seem to recall BBC Enterprises have tried commercial sales of the show before to the likes of HGTV, and certainly have done a few backdoor pilots with American ex-pats as contestants to try to peak some interest overseas in either buying it in or remaking it, but nothing came of it.