Today's meetings at Ayr and Sedgefield have been called off due to frost and snow and Kempton's card has been put under threat by a worsening weather forecast.
"We have had bit of rain but the going is still soft - the only thing that has changed is the forecast," Michael Webster, the clerk of the course, said.
"In view of forecast temperatures of minus six degrees Celcius, there will be a precautionary inspection at 6.30am.
"The inspection is timed so that the result can go out on the first racing bulletin on Radio 5 Live at 6.55."
Hereford's meeting is also subject to a precautionary inspection at 7.30am because the forecast is for frost.
Edinburgh's card tomorrow is also in doubt. "The course has frost and snow and an inspection will be held at 9am on Boxing Day," the course's manager, Mark Kershaw, said.
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