He seems to like two feeds about an hour apart during the night, last night it was 2 & 3, night before it was 9 & 10 so not really clustering.

Right side feeding is only sore on attachment now (most of the time) and left doesn't hurt at all with the use of the pump. He had an expressed milk bottle yesterday and drunk about 100ml, is that about right? Takes me two pumping seasons to get that amount but not worried as I know he's a better pump than a piece of plastic.