Maserati 250F

This is a photograph I took in the paddock at the Coys International Historic Festival meeting at Silverstone in July 1997.

It's a Maserati 250F but isn't listed in the programme of the event. I've seen photographs showing that Stirling Moss drove it in the HGPCA Pre-1960 Grand Prix Cars Race but I've not been able to find out the owner or chassis number.