Core plugs are also known as expansion plugs, welch plugs and sealing discs - a point to remember when buying one.
Change an Engine Core Plug - Land Rover Monthly
Change an Engine Core Plug - Land Rover Monthly
Core plug weeping - any hope of replacing w/ engine in car? : MGA Forum : The MG Experience
Replacing core plugs
Core plug / Freeze plug? : Morris Minor Forum : The Morris Minor Forum
How to Replace Engine Block Freeze Plugs (Expansion Plugs)
Disco 2 - TD5 head core plug behind manifold
Core Plug Puller
Engine re-build almost there – Life with a Freeman 22 MKII
Replacing core plugs
engine - How to Remove Core Plugs? (aka Freeze Plugs) - Motor