Then it's a good reason not to overly concern yourself (given the timing accuracy of many aerodrome forecasts for LTN, nowadays...)
Issued by Met Office.
Valid from: Tuesday 27 December, 2005 at 18:00
Expires on: Wednesday 28 December, 2005 at 10:00
Heavy Snow Affecting Bedfordshire
Snow showers will continue to affect many areas with accumulations of between 3 and 6cm, but with up to 12cm possible in a few places.
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This is the second warning for the great British public today that mentions Bedfordshire and Luton in particular. The warning up to 18.00 was for between 2 and 10 cm of snow. What have we got so far? Bugger all. My £60 all in one weather station says tonight will be mainly dry with clear periods. I have to say I have more faith in my weather station. Its readings at 23.00 are temp -1.4C, humidity 96% air pressure 1015mb