This is a repaint almost for sure - the pix show a Reynolds 531 DB decal on the seat tube and during the 'Holdsworth years' Grubbs were only built in 531 plain guage (as far as I'm aware).
Also - not a track bike as advertised - but the bog standard catalogue road / touring frame... At least the vendor hasn't added the dread "fixie / fixed" appellation to the listing!