Peter, I can't answer your questions, but have found your crunching down the matters rather provocative. I'm decidedly on the wrong list -- am USAmerican born (tho now living in the UK), am a playwright who writes poetic stretches in plays, and regard most poetry (yes, most poetry) as sometimes engaging, playful blow-ups of an element or two of that which makes up poetry. And, thoroughly non-BritPo, I guess, my poet faves are Mary Sidney ('Shakespeare', as her works are known) in the poetic bits of her plays but not her sonnets, as well as some parts of the musical DT's 'Fern Hill'. Others' poetry, from time to time, I 'like very much' but not so completely and utterly as Mary Sidney's.
And I explode with boredom when folks try to categorise and list-ise poetry and poets (tho I happily and seriously do it m'sel'). I do read all these threads and contemplate what's behind and around them, usually wonder what in the world you lot are going on about. ;-)
Best, Judy