Is there a currently produced, UK available 16 bit DAC for Arduino?
If not i'll get a minima and accept that, but I would definitely prefer a 16 bit DAC.
You mean on a breakout board? There are hundreds of such chips, but without a good voltage reference and stable power source there's no point going beyond 12 bits really...
Or is this for audio? I2S DACs are normally used there, requiring a microcontroller that can drive them and generate low-jitter I2S clocks.
Well, it is for audio, but not for .wav playback or anything.
I really don't mind if it is a breakout board, I suppose that would make it easier. An I2C or I^2S would be fine too.
Are they common then? Can you recommend one that is affordable and readily available?
I assume that that board can be configured to output a constant voltage as well as a sine wave? And everything that I could image doing with a normal DAC, could be done with it?
No, don't assume anything, read the AD5693R documentation. 
And note that I2C DACs have to be slow due to the slow I2C bus. SPI devices can be much faster, as are I2S.
Check out PT8211.
10pcs for under $5.
ADS1115 is another option.
Inexpensive and widely available.
That seems to be an ADC not a DAC.
Yes, you're right. It goes the other way around.
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