On 06/08/13 13:09, Dave Liquorice wrote:
On Tue, 06 Aug 2013 12:16:28 +0100, Janet Tweedy wrote:

I'd guess that a good freezer has enough insulation to make that
unnecessary.

think you only need to cover freezer in the event of a power cut

The bottles of frozen water would probably be better at keeping the
temperature down under power fail conditions.

Without doubt the more mass at low temperature,
the better, and that should be the first line of
defense.

All a blanket will do is reduce the heat flow
"input" (i.e. leaking into) an unpowered freezer,
so it will merely delay the inevitable a little.