Overnight min +0.0 Current temperature +0.3 deg C.
Just too much wind overnight (1-3 knots) for lower temperatures.
Probably -2 or -3 deg C in the well known frosty spots in the South Hams or in
the Teign Valley.

Will,

It went down to -0.9C in the Otter Valley last night though for most of
the night the temperature fluctuated between 1 & 3C as there was a
slight breeze about, this breeze finally gave up during the latter half
of the night allowing the temperature to fall below freezing.
________________
Nick G
Otter Valley, Devon
83 amsl