The Splittie has been donated by Malcolm Railson and Children in Need will benefit as a result.
The auction house has offered to waive its usual fees for the lot as well as donating 50% of overall profits from the sales to the charity.
Boss Nick Whale, said: “Silverstone Auctions is delighted to play a key role in CarFest to help raise lots of money for a very worthy cause.
"We’ve put together some fantastic cars for the sale, so I’d encourage visitors to dig deep in order to secure their very own pride and joy."
Day tickets for those wishing to bid on a car at CarFest can be obtained from Silverstone Auctions by calling 01926 691141, but telephone and internet bidding will be live on the day.
For more information about the ‘Pride & Joy’ car auctions, click here.