Lots of things to check and some great advice, thanks all!
I only have a side stand so checking oil is a bit tricky - I did get my son to have a look while I held the bike upright, not ideal. I suspect the oil is getting low as the engine has that slightly rougher feeling that I recognise from my CBF when oil was getting low.
Probably lots of things stretching and changing as it beds in as peeps have mentioned - I guess that's why the 1st service is at 600 miles. Will mention it to the dealer and hopefully all will be well.