There is a vast choice of 240v sub pumps on the market. If they're too big to fit through the IBC filler hole, cut a couple of slots from the edge of the hole so you can open it up, drop the pump through then close the slots up again. Screw the lid back on and cover the slots with gaffer tape or similar.
I've got two Draper sub pumps, one in the IBC and one in my waste water sump, cost me about £35 each