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As once shared over on Popscene many moons ago (well, 2010):
Until early 1971: Helvetica Bold (end credits)
January 1970-at least early 1971: Stencil (chart positions in chart rundown), Futura Light (artist name in chart rundown), Helvetica Bold (end credits)
at least early 1971-at least summer 1973: Acton DB (main logo/chart positions in countdown/cast and crew names), Kabel LT Std Book (artist name in chart rundown), Futura Light (crew titles in end credits)
at least summer 1973-July 1981: City Bold and City Medium (chart rundown/cast and crew names on end credits), Gillies Gothic Extra Bold (crew titles)
August 1980-January 1984: Riley 2 caption generator default font (based on Helvetica) (performance intro/outro captions)
Chart rundown, July 1981-June 1984: RockoFLF Bold (may not be official name of font) (artist name), (unknown font) (chart position)
End credits, July 1981-February 1984: Folio Extra Bold (cast and crew names), (unknown font) (crew titles)
Performance captions, January-March 1984 and end credits, February-March 1984: DIN 17 SB
Performance captions/end credits, March 1984-October 1984: Normalise DIN
November 1984-July 1987: Clarendon, usually italic (used on chart rundown from September 1984)
July 1987-December 1988: Times New Roman (chart position on performance intro captions/chart rundown), Futura Bold Condensed (everything else)
25 Years special: Bembo
January 1989-January 1990: Univers LT Std 59 Ultra Condensed (chart position on performance captions/chart rundown), OCR-B (everything else)
Review of the 80s: Rockwell and Rockwell Extra Bold
January-April 1990: ITC Kabel Std Medium
April-December 1990: Baskerville Italic (chart position on performance captions/chart rundown), Kabel DT Condensed Bold (everything else)
December 1990-September 1991: Photina MT Italic (chart position on performance captions/chart rundown), ITC Kabel Std Medium (everything else)
October 1991-January 1995: Fritz Quadrata (artist/song title, various fonts for chart positions on performance captions)
February 1994-January 1995: Helvetica Black (chart position on performance captions/chart rundown); Futura Black ("facts" on performance captions)
February 1995-April 1998: Template Gothic Bold
May 1998-November 2003: ITC Avant Garde Black (logo), Helvetica Black (chart position on performance captions), Helvetica Bold (artist/song title on performance captions), ITC Avant Garde Bold (chart positions)
November 2003-June 2005: a custom-made font IIRC
June 2005-December 2007: Bauhaus Std Medium
December 2007: Chicago Medium (also known as Truth FB Medium)
December 2008-January 2013: Handel Gothic Bold
Comic Relief 2009 special: Gill Sans
December 2013 onwards: (unknown font)
That 1981-1984 chart rundown/end credit font (also see the c.1979-1987 ITV Schools clock) has proved incredibly elusive; the usual resources like WhatTheFont can't identify it.
Until early 1971: Helvetica Bold (end credits)
January 1970-at least early 1971: Stencil (chart positions in chart rundown), Futura Light (artist name in chart rundown), Helvetica Bold (end credits)
at least early 1971-at least summer 1973: Acton DB (main logo/chart positions in countdown/cast and crew names), Kabel LT Std Book (artist name in chart rundown), Futura Light (crew titles in end credits)
at least summer 1973-July 1981: City Bold and City Medium (chart rundown/cast and crew names on end credits), Gillies Gothic Extra Bold (crew titles)
August 1980-January 1984: Riley 2 caption generator default font (based on Helvetica) (performance intro/outro captions)
Chart rundown, July 1981-June 1984: RockoFLF Bold (may not be official name of font) (artist name), (unknown font) (chart position)
End credits, July 1981-February 1984: Folio Extra Bold (cast and crew names), (unknown font) (crew titles)
Performance captions, January-March 1984 and end credits, February-March 1984: DIN 17 SB
Performance captions/end credits, March 1984-October 1984: Normalise DIN
November 1984-July 1987: Clarendon, usually italic (used on chart rundown from September 1984)
July 1987-December 1988: Times New Roman (chart position on performance intro captions/chart rundown), Futura Bold Condensed (everything else)
25 Years special: Bembo
January 1989-January 1990: Univers LT Std 59 Ultra Condensed (chart position on performance captions/chart rundown), OCR-B (everything else)
Review of the 80s: Rockwell and Rockwell Extra Bold
January-April 1990: ITC Kabel Std Medium
April-December 1990: Baskerville Italic (chart position on performance captions/chart rundown), Kabel DT Condensed Bold (everything else)
December 1990-September 1991: Photina MT Italic (chart position on performance captions/chart rundown), ITC Kabel Std Medium (everything else)
October 1991-January 1995: Fritz Quadrata (artist/song title, various fonts for chart positions on performance captions)
February 1994-January 1995: Helvetica Black (chart position on performance captions/chart rundown); Futura Black ("facts" on performance captions)
February 1995-April 1998: Template Gothic Bold
May 1998-November 2003: ITC Avant Garde Black (logo), Helvetica Black (chart position on performance captions), Helvetica Bold (artist/song title on performance captions), ITC Avant Garde Bold (chart positions)
November 2003-June 2005: a custom-made font IIRC
June 2005-December 2007: Bauhaus Std Medium
December 2007: Chicago Medium (also known as Truth FB Medium)
December 2008-January 2013: Handel Gothic Bold
Comic Relief 2009 special: Gill Sans
December 2013 onwards: (unknown font)
That 1981-1984 chart rundown/end credit font (also see the c.1979-1987 ITV Schools clock) has proved incredibly elusive; the usual resources like WhatTheFont can't identify it.

