Can't help with the unique Birkin single-seater, but I can give a benchmark price for a Bentley with a recognised racing pedigree.
A friend of my grandfather's died about six years ago and amongst his effects was a Bentley 4.5 litre which was raced at Brooklands by WB Scott. In fine order it fetched £300,000, which rather surprised my father who was still firmly of the belief that you paid about a hundred pounds per litre of Bentley (the going rate in about 1954!)
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