OED lists two ways of pronouncing negotiate:
Brit. /nᵻˈɡəʊʃɪeɪt/ , /nᵻˈɡəʊsɪeɪt/
Which British dialects use /s/ rather than /ʃ/ and in what contexts does this difference appear?
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I don't think any British dialect uses /s/ here. /nɪˈgəʊsɪeɪt/ might be used by someone speaking 'hyper-correctly', referring back to the word's earlier pronunciation. But north, south, east or west, most Brits would say /nɪˈgəʊʃɪeɪt/ or /nəˈgəʊʃɪeɪt/ [with the usual variations of the 'long-O' and 'long-E' sounds]. And @citizen, I agree: whoever says it with an /s/ probably also does the same with 'initiate'.