Oh no Doe - PLEASE... Let us keep this one - that Brian still on top of his game in 1966 could author something like that 'vege-ta(b)le' (at least until hard or at least circumstantial evidence is uncovered to prove otherwise - something that someone like yorself would be able and willing to dig up(?))
And for somebody - anybody to even suggest that Brian didn't write that other fairytale (Mt. Vernon & Fairway) would be strictly no-go! So don't go there... EVER
No sweat, I've no trouble believing Brian wrote "Mt. Vernon..." - even with Jack narrating, it still
sounds like Brian. Plus, JFR told me he witnessed Brian writing it (allegedly, he did that by sticking letters in a notebook, one by one...).
The 1966 'tale', however, sounds more like Derek Taylor to me.