I offered Josh some EBM after his 11:30pm feed and he didn't want it so I can only assume he got enough in the feed. The only thing now is Iin my sleepiness I forgot to put it back in the fridge and it's been 4 hours so I don't think I can use it now.
Just as a side issue, I'm pretty sure you can't store the rest of a bottle once DS has sucked on it, due to the germs in his saliva. (it can be really frustrating sometimes! so it's a good idea just to heat up a small amount at a time - you can always do more if you need to )