I'm sure this is either a Marlboro or Falcon cycles Holdsworth (more likely Falcon era)...sorry but not a proper Holdsworth - date circa mid-80s on.
I think the Holdsworth name had disappeared completely by the mid-90s.
Not saying it's a bad bike.
Guess 531 maintubes only? Looks like it might have some reasonable components.
P.S more images would help though.
Co-founder of a V-CC section, member South Eastern Road Club and owner of - 2005 Bianchi Reparto Corse (modern), 1985 Raleigh SBDU Pro Super, 1984 Raleigh LU Corsa, 1980 Allin Stan Butler Special, 1978 Ron Cooper, 2 x very early Roberts (late 60s/early 70s), 1975 Bill Philbrook tourer, 1966 Raleigh Superbe Roadster, 1964 Allin Stan Butler Special Belgique, 1951 Hobbs of Barbican S/C, 1950 Hobbs of Barbican S/C, 1947 Hetchins Super Special, 1908 Centaur Featherweight. 1988 Specialized Stumpjumper.