Transfers from Moore
Transfers from Scott
Transfers from Dixon
Transfers of unknown source
By far the largest contributor of recycled plates was Moore: triple the number that came from Scott (21 vs 7, or 26 vs 7 if you include the Dixon transfers). And there's some doubt whether the 7 transfers I've attributed to Scott did indeed come from that pottery. Why not Newbottle?
There is homogeneity of decoration across all the groups above (I have livened things up by including less typically decorated items). You'll see where I'm going with this. There's little reason to suspect that these plaques were decorated at multiple locations. And if they were decorated at one location, surely Moore is our front runner.