The Richard Seaman Trophy Vintage Car Races meeting at Oulton Park in August 1992 organised by the VSCC included a 4-lap Handicap Race for Edwardian Cars. Pictured below is one of the cars that took part in the race.
It's shown in the programme of the event as a 1908 Napier and I've seen this car described as a type 65R and as a T21. The programme said this about it:
'Trevor Tarring's 1908 60hp six-cylinder competition Napier has the largest engine in the race. With no less than 11.6 litres, Christopher Bird posted second fastest time at a Shelsley Walsh hillclimb with this car in 1911'