Hi Bert/Henrik (Henrik no worries...I have mornings like that)

As they say....RTFDS!

I have to say I'm puzzled here.. a day or two ago, while dabbling, I'm pretty sure I set the ADC pref to internal FVREF...and then set the FVREF to 1.024V - it worked?! (so I guess the answer is the lowest I can take VREF is 1.024V....but I'm not meant to! Therefore to get a better 'official range' would be option 2 above....use a lower VCC.....1.8V)

Many thanks