Thanks for your reply Christian.
The plug is plastic coated steel. As I don't have a welder or a slide hammer, I am considering passing a very big self tapping screw (with a big washer under its head) through a suitably sized socket in the hope that tightening the screw will draw it out. I have seen a picture of a core plug removal tool that works in this way.
I have also read on a car sites that people just hammer a metalwork chisel through them and lever them out.
Mark
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