Clerk of the course Andy Jardine said: “There are still too many unknowns.
“We currently can’t have two people in a car from different households, we don’t know how travel between the tiers will go after new year and there is no prospect of being able to allow spectators into the stages.
“When you take all these things into account it is safer leaving it for a year and put our efforts into the 2022 event.
“The priority now is for us to keep following the government guidance, sparing a thought for those that have suffered and look forward to life returning to normal.”