Might not be of any use to any one, but i didnt have a clue how to get them out
How to remove core plugs, this is on a xe/let engine
you will need
hammer
cold chisel
mole grips
small flat blade screwdriver
One core plug
Hit a x in the core plug to it free the plug in the hole
Hit the core plug with a chisel and hammer (hit the top of the core plug rim/top, not in inside as it will just punch a whole in it)
it should roll around like so
connect a set of mole grips and pull
jobs a goodun
hope i done it right