Of all the stupid things I have heard, this is up there with the best of them.
This is from Anna Raccoon's Blog
'Britain has International agreements which govern the size and thickness of the corrugated sheets we are allowed to donate. Anything else would apparently cause confusion as you attempt to shelter from the rain and the winds under a collection of sheets that were not altogether uniform in size with those arriving from, say France, or the USA. You might not care about such things, but the civil servants in charge of these matters do.'
You can read the whole blog here.