Didn't really know where to put this as there isn't a general entertainment thread and many of these name aren't Hollywood.
I went through the latest (Spring–Summer) issue of Equity magazine in the same way I did SAG-AFTRA.
There's a few names of note who have passed off radar.
Firstly, everyone we already mentioned on here:
Michael Apted (wiki) died 7/1/21
Bobby Ball (wiki) died 28/10/20
Len Barry (wiki) died 5/11/20
Jean Bayless (wiki) died 5/2/21
Helen Blatch (wiki) died 31/12/15 (late announcement)
Johnny Briggs (wiki) died 28/2/21
Jeremy Bulloch (wiki) died 17/12/21
Roy C (wiki) died 16/9/20
Malcolm Cecil (wiki) died 28/3/21
Pauline Chamberlain (IMDb) died 14/1/21
Johnny Clark (wiki) died 28/12/20
Sean Connery (wiki) died 31/10/20
Peter Craze (wiki) died 31/12/20
Norm Crosby (wiki) died 7/11/20
Alan Curtis (wiki) died 18/2/21
Mac Davis (wiki) died 29/9/20
Anthony Dawes (wiki) died 21/1/21
Nathalie Delon (wiki) died 21/1/21
Bobby Dennis (IMDb) died 7/11/20
Jackie Dennis (wiki) died 28/9/20
Sydney Devine (wiki) died 13/2/21
Mark Eden (wiki) died 1/1/21
Rhonda Fleming (wiki) died 14/10/20
Ronald Forfar (wiki) died 28/9/20
John Fraser (wiki) died 6/11/20
Tex Fuller (wiki) died 7/10/20
Peter Goodwright (wiki) died 2/11/20
Dominic Grant of Guys 'n' Dolls (wiki) died 18/11/20
Andy Gray (wiki) died 18/1/21
James Greene (IMDb) died 5/1/21
Patricia Healey (IMDb) died 4/2/21
Tony Hendra (wiki) died 4/3/21
Hal Holbrook (wiki) died 23/1/21
Godfrey James (wiki) died 29/10/19 (late announcement)
Rafer Johnson (wiki) died 2/12/20
Hugh Keays-Byrne (wiki) died 2/12/20
Lynn Kellogg (wiki) died 12/11/20
Rosalind Knight (wiki) died 19/12/20
John le Carré (wiki) died 12/12/20
Gunnel Lindblom (wiki) died 24/1/21
Tiny Lister (wiki) died 10/12/20
Archie Lyndhurst (IMDb) died 22/9/20
Jane Manning (wiki) died 31/3/21
Gerry Marsden (wiki) died 3/1/21
Vivian Matalon (wiki) died 15/8/18 (late announcement)
Helen McCrory (wiki) died 16/4/21
Les McKeown (wiki) died 20/4/21
Frank Mills (wiki) died 11/2/21
Anthony Milner (wiki) died 6/7/15 (late announcement)
Elijah Moshinsky (wiki) died 14/1/21
Basil Moss (wiki) died 28/11/20
Johnny Nash (wiki) died 6/10/20
Trisha Noble (wiki) died 23/2/21
Margaret Nolan (wiki) died 5/10/20
Des O'Connor (wiki) died 14/11/20
Rynagh O'Grady (wiki) died 7/2/21
Nicola Pagett (wiki) died 3/3/21
Geoffrey Palmer (wiki) died 5/11/20
Trevor Peacock (wiki) died 8/3/21
John Pennington (IMDb) died ??/?/20
Molly Peters (wiki) died 30/5/17 (late announcement)
Ronald Pickup (wiki) died 24/2/21
Valerie Pitts (wiki) died 31/3/21
Eileen Pollock (wiki) died 19/12/20
Kay Purcell (wiki) died 23/12/20
James Purify of James & Bobby Purify (wiki) died 22/1/21
Tommy Rall (wiki) died 6/10/20
Marion Ramsey (wiki) died 7/1/21
John Richardson (wiki) died 5/1/21
Paul Ritter (wiki) died 5/4/21
Tanya Roberts (wiki) died 4/1/21
Jimmie Rodgers (wiki) died 18/1/21
Liam Scarlett (wiki) died 16/4/21
Ken Sedd (wiki) died 9/1/21
John Sessions (wiki) died 2/11/20
Billy Joe Shaver (wiki) died 28/10/20
Barbara Shelley (wiki) died 3/1/21
Tony Tanner (wiki) died 8/9/20
Pamela Tiffin (wiki) died 2/12/20
Dave Toole (wiki) died 16/10/20
Peter Vere-Jones (wiki) died 26/1/21
Philip Voss (wiki) died 13/11/20
Lee Wallace (wiki) died 20/12/20
Neville Wanless (wiki) died 4/12/20
Mary Wilson (wiki) died 8/2/21
Barbara Windsor (wiki) died 10/12/20
Frank Windsor (wiki) died 30/9/20
Jimmy Winston (wiki) died 26/9/20
Everyone we haven't mentioned whose deaths were noticed elsewhere:
Hugh Beresford (wiki) died 23/11/20 – operatic baritone, aged 94, got a Guardian QO
Dee Cannon (wiki) died 28/9/20 – acting coach, aged 58 from cancer, got late obits from The Stage and the Hollywood Reporter
Rosanna Carteri (wiki) died 25/10/20 – Italian soprano, aged 89, got a Telegraph QO
Robert P. Cohen (IMDb) died 17/12/20 – American assistant director and co-producer, aged 76 from COVID-19, got a HR obit
Marcus D'Amico (wiki) died 16/12/20 – best known as Michael Tolliver in Tales of the City, aged 55 from pneumonia, HR obit
Louise Dunn (IMDb) died 11/8/20 – aged 81, some minor roles in 60s British films, also Emergency-Ward 10, got a Stage obit
Jenny Dunster (IMDb) died ??/3/21 – dancer on British TV turned agent, aged 71, got a Stage obit
Robert Gard (wiki) died 20/3/21 – operatic tenor, aged 94, a few Aussie obits (his adopted home)
Jacques Godin (wiki) died 26/10/20 – Canadian actor, aged 90 from heart failure, local obits only
Andréa Guiot (wiki) died 15/2/21 – French operatic tenor, aged 93 from COVID-19, a few industry obits
Doreen Hermitage (IMDb) died 7/9/20 – choreographer, died aged 87. Received an obit from The Stage
John Hole died 20/2/21 – theatre writer, producer and director, died aged 81. QO from The Guardian
Arif Hussein (IMDb) died 20/2/21 – actor, screenwriter and producer, aged 63 from COVID-19. QO from The Guardian
Ben Jorgensen (IMDb) died 6/10/20 – actor, known for his role in The Basketball Diaries, aged 51 from suicide, some minor obits
Jean Kitson (IMDb) died 1/7/20 – actress, aged 91, known for her roles in Tales of the Unexpected. Received an obit from The Stage
David Knight (IMDb) died 20/12/20 – American actor, aged 92, received a couple of minor obits. Mentioned on the Forum once by @Clorox Bleachman
Helen Madden died 6/11/20 – UTV presenter, aged in her 70s, received local obits
Madeleine Newbury (IMDb) died 27/9/20 – Actress with credits in The Bill, The Professionals, The Lenny Henry Show, aged 89, got an obit from The Stage
Keith Nichols (wiki) died 21/1/21 – Jazz multi-instrumentalist, aged 75 from COVID-19, QO from The Telegraph
Diana Payne-Myers (IMDb) died 7/11/20 – Dancer, with a few minor acting credits. QO obit from The Guardian
Jennifer Phipps (wiki) died 18/4/19 (late announcement) – Canadian actress, aged 87, local obits only
Alice Playten (wiki) died 25/6/11 (late announcement) – American voice artist, aged 63 from pancreatic cancer, got a NYTimes obit
Eugenia Ratti (wiki) died 14/11/20 – Italian operatic soprano, aged 87, some industry obits
Marvin Roy (IMDb) died 1/7/20 – American magician, aged 95, received a HR obit.
Gary Scott died ??/4/21 – Travel reporter for talkSPORT, LBC etc., received local coverage
Sarah Vernon (IMDb) died 13/1/21 – Actress (mainly in theatre), aged 64, received an obit from The Stage
Pamela Wardel (IMDb) died 20/12/20 – Actress best known for her role in The Avengers, aged 94, death only covered on FB and an Avengers fan forum
And finally those who have pretty much died completely off radar (date of death and ages unknown unless stated):
Mary Chester (IMDb) Appeared in dozens of credits from 1958 to 1999, including multiple appearances in Coronation Street, Z-Cars and Emergency-Ward 10.
Patricia Driscoll (wiki) Irish actress, presumably aged 92–93, married to British actor Duncan Lamont, who died in 1978. Appeared in a bunch of British films in the 1950s and 60s.
Leonard Gregory (IMDb) Played D.S. West in 20 episodes of EastEnders from 1986 to 1989, also minor roles in Z-Cars and The Bill.
Michael Hadley (IMDb) Roles in both film and TV from 1971 to 2017. Uncle of actress Felicity Jones, who mentioned in this December 2020 interview that he had recently died.
Beryl Hall (IMDb) Welsh singer with a few minor acting roles. Known for her cover of You'll Never Walk Alone.
Jennifer Marriott (IMDb) Actress best known for playing Miss Bates in Grange Hill in the early 90s.
Rosemary Miller (IMDb) New Zealand actress who later settled in Britain after marrying English actor Peter Hawkins (died 2006). Presumably aged 91–92, notably appeared in Emergency-Ward 10.
Patrick Monckton (IMDb) Died 16/12/20, aged 73, had roles in film like Keeping Mum and The Dark Crystal, also in TV (The Bill, Poirot etc.)
Patti Nicholls (IMDb) Appeared in Rita, Sue and Bob Too as Sue's Mother
Johnnie St. George (IMDb) Played Edwin in Coronation Street in 1984
Eric Stovell (IMDb) Actor with roles in The Meaning of Life, Poirot and The Count of Monte Cristo (2002)
Neil Sweetmore (IMDb) Wardrobe for Poirot and The Two Ronnies
Alan Tobin (IMDb) Long running appearances in Home and Away, also appeared in Z-Cars and Young Guns
Vimal Vaz (IMDb) Actor with no significant roles, appeared and directed a film called Jade Dragon which seems to have picked up a few awards
Genevieve Walsh (IMDb) Actress with the odd appearance in Life on Mars, Doctors, Casualty, Emmerdale etc.
The Autumn/Winter issue should be along soon so I'll cover that when it comes out.