Hi, 
I went with the "<parish><path-type><number>" format as that is consistent with other PRoWs in Cornwall (though I admit, I have added a lot of those) and works with Rob W's online tool. It also matches the wiki based on previous talk-GB formatting discussions. I didn't think I should remove the "official" numbering entirely though, which is why I moved it to an official value.  I don't think we have to match the exact formatting as the council in our tagging but I know you disagree (based on past wiki discussion comments). Might be worth another discussion, perhaps in the forum?