Fair enough - I didn't realise that they were regional too. I thought they were more like English clubs - but now you say it, it does make sense.
It's actually even more complicated than that in Scotland because this season they set up an additional tier of six so-called regional franchise clubs sitting between Edinburgh and Glasgow and the traditional clubs like Watsonians, Hawick etc. (I say so-called regional because despite that being the supposed aim Edinburgh has three and Glasgow none!).