Own work, based on the vowel charts in Beaken, Michael Alan (1971) A study of phonological development in a primary school population of East London (Doctoral thesis)[1], UCL, pages 197, 200. /ɪj/ and /ʉw/ are shown here with an unrounded mid central starting point: [əj, əw]. /əw/ too is shown with a much more open starting point, overlaping with STRUT: [ɐw]. /oj/ is shown here with an unshifted starting point [ɔj], which other sources (see e.g. Accents of English) consider to be shifted to [oj].
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