When to drop a feed?!

Our currently food/bottle schedule looks like this: 7am - bottle 8.30am - breakfast 11am - bottle 2.30pm - bottle 5pm - tea 6.30pm - bottle 9pm - breastfeed When can I drop the 9pm feed? Any tips on how to do it? Baby sleeps 7-7 and I wake him at 9 to feed! Xx