Right so, my saxos been de-wipered!

And iv iv got a rubber blaniking gromit in the hole at the moment!
BUT iv heard horrific stories, of people having the rubber bung pushed through, and a coat hanger put through the hole, and having their boot unlocked, causing them to have things stolen!

My dad had the bright idea of getting a plumbing planking plug (like for blocking tap holes etc)
But i cant find one with a 10mm diameter

What have other people used to stop this?
Or is there nothing that can be done?
Any help would be greatly appreciated
Many thanks!