In article ,
"dennis@home" says...

"nightjar .uk.com" nightjar@insert my surname here wrote in message
...

I suggest you contact the Ministry of Defence. They have recent experience
of using moats to protect buildings, although these days they are designed
to look like ornamental lakes.

Having just watched Top Gear and the driving of wheeled vehicles across
Icelandic lakes the MOD may need to reconsider using water for protection.

Are you familiar with the expression "sitting ducks"?