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Wolfson WM8940

I know this isn't specifically about Keil, but I've explored all avenues I can think of and had no joy.

Has anyone here got any experience with the Wolfson WM8940 codec?

I've got one connected to an LPC3250 via the I2C bus (using Keil tools), but can't get it to do anything I tell it.

I know it is accepting the data (through 'scoping and the I2C getting all the necessary ACKs).

The closest I've got is by only sending a single 8 bit register values - Whereas the documentation states that two 8 bit bytes are expected.

Any help would be appreciated.