Ludlow to inspect
Wednesday's fixture at Ludlow is subject to an 8.30am precautionary inspection on raceday morning.
Frost is the key issue at the Shropshire venue, with forecast overnight temperatures due to dip below freezing.
The course is already frozen in places following a bitterly cold night.
Clerk of the course Bob Davies said: "Last night we were forecast -3C, but we went down to -6C.
"We have covered the vulnerable areas and take-off landings in fleece, but you can't cover every part of the track.
"If the temperature stays below freezing all day, I think the chances are very remote (of racing).
"We will update the situation at around midday."
