Very nice Holdsworth frame with Simplex Lugs from the '70s (55cm at only £100):
http://www.ebay.co.uk/itm/Vintage-Holdsworth-55cm-21-5-Frame-Reynolds-531-Beautiful-Lugs-/231320609849
Or VERY expensive, but original Holdsworth here:
1946 Holdsworth Path Cycle Frame and Forks 23" with Chater Lea Head Clip 531
http://www.ebay.co.uk/itm/1946-Holdsworth-Path-Cycle-Frame-and-Forks-23-with-Chater-Lea-Head-Clip-531-/161408086575
Lovely, but at £1200 way out of my league.
@anidel started
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Very nice Holdsworth frame with Simplex Lugs from the '70s (55cm at only £100):
http://www.ebay.co.uk/itm/Vintage-Holdsworth-55cm-21-5-Frame-Reynolds-531-Beautiful-Lugs-/231320609849
Or VERY expensive, but original Holdsworth here:
1946 Holdsworth Path Cycle Frame and Forks 23" with Chater Lea Head Clip 531
http://www.ebay.co.uk/itm/1946-Holdsworth-Path-Cycle-Frame-and-Forks-23-with-Chater-Lea-Head-Clip-531-/161408086575
Lovely, but at £1200 way out of my league.