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Update May 24th those silly councils are getting their cash out, but don't worry -
From Martins money blog - IS SANTANDER SAFE?
"3. Why are a few councils withdrawing cash?
The most important thing to understand is that while money saved by consumers is protected, money invested by councils and large businesses isn’t, so in the unlikely event even a fully UK regulated bank went bust, they wouldn’t get their cash back.
So during the Icelandic bank collapse, while no UK savers lost money as it was protected and paid out by the government, many councils and institutions use more complex ways of savings (ie, we’re not talking just cash in accounts here) and were exposed.
This has made some adopt an ultra-cautious stance and they are relying on credit ratings to help set their policies. I suspect there are some tick-box exercises going on here (ie, they need to keep cash within banks with certain credit rating settings)