“Roach (2004) notes that many people in England use [o:] for this vowel, but also that RP traditionally distinguishes between maw /mo:/ and moor /mʊə/, tore /to:/ and tour /tʊə/, as well as paw /pɔː/ and poor /pʊə/. If one wishes to make that distinction today it would be best to use ɵ instead of ʊə. This will lead to tore as toː and tour as tɵː”.
Well, I didn’t write that, and I don’t see the merit of transcribing tour as tɵː. This makes me wonder if the other columns are as unreliable. I will try to correct the RP column when I get some time.