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  • Definitely 23017 not 23S17, I checked that last night before posting to make sure I'd covered as many potentially silly issues as possible :).

    Tried the software I2C trick, changed from I2C2 to new I2C() and everything worked perfectly. Then I tried changing back to hardware I2C and it worked perfectly too, so then I tried power-cycling and trying hardware I2C and it still works - I can't really explain what fixed the issue, perhaps establishing a solid software I2C link kicked something in the MCP chip and got it in a good state, but it's working now.

    I'll keep an eye on it and monitor for any instability, thanks for your help :)

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