Sunday TV in the 70s was very different to today. It didn't really seem to get going until the afternoon.
I'm was too young to see those when they came out, but like you I still associate a Sunday afternoon film with B&W oldies repeated on TV. Old Alec Guinness and John Mills films etc. I especially liked the 60's ones. Whistle Down the Wind is great.
In the morning we had religious services on both main channels, as well as farming programs. At noon there was Weekend World for current affairs, followed by University Challenge (both on ITV, which was very different in those days). Early afternoon there'd be something like The High Chaparral and you'd usually get a B&W film at about 2 or 3 in the afternoon. Then at about 5-ish you'd get something like Black Beauty (a really good TV series IMO).
At about 7 there would be a LWT sitcom like On the Buses. Then TV would seem like a normal evening from then on.
ITV at about 10 would have an arts program (Aquarius or The South Bank Show). The BBC might have Barry Norman with Film XX.
I managed to find a listing of programs from BBC 1 from 20 November 1977:
0915 The Sunday Gang
Take a look at God's world with John Dryden, Tina Heath, Jill Shakespeare and Glen Stuart. Mackintosh Mouse opens a Munch Inn and Dodo has a conversation with herself.
0940 Nai Zindagi Naya Jeevan
A magazine for Asian viewers. Produced and presented by Mahendra Kaul.
A series of twenty-six programmes in Hindustani and English. The story of two asian families living in Britain - the neighbours of Windsor Road. Episode 8.
1025 Trade Union Studies
'Year Two - Trade Unions and the Economy'. Ten programmes for trade unionists. 7: 'Fairer Shares'.
A series of twenty-five programmes for beginners in German. 8: 'Um Die Ecke'.
A series of ten programmes. 8: 'Allez Les Verts!'
1140 On the Move
A lively look at words and letters with Donald Gee and Bob Hoskins with Polly James, Martin Shaw, Nigel Stock and Gay Hamilton.
1150 Your Move
Brush up your reading and writing with Brian Redhead and Ian Lavender, Arthur Lowe and Barbara Windsor.
1215 Sunday Worship
1325 The Craft of the Potter
A series of five programmes presented by Michael Casson. 5: 'Talking About Pots'.
1350 News Headlines
1355 Film of the Book: Black Narcissus
1530 The High Chaparral
'The Lost Ones'.
1620 Bugs Bunny
1630 The Osmonds
Starring Donny and Marie.
1700 Royal Heritage
5: 'The First Three Georges'.
Can't imagine The Craft of the Potter on BBC1 on a Sunday afternoon today. That would be on BBC4 (if it was lucky).
Here's the ITV schedule for 05 June 1977 (notice the 10 AM start):
1000 Morning Worship
Jubilee Mass. A mass to commemorate the Queen's Silver Jubilee from the Roman Catholic Church of St Marie, Sheffield. The celebrant and preacher is the right Rev Gerald Moverley, J.C.D., Auxiliary Bishop of Leeds. [Yorkshire Television Production].
1100 The Beachcombers
'Potlatch'. Adventure in British Columbia.
1130 A House for the Future
Part 3: 'Other Lives: Other Life Styles' with Brian Trueman. Work on converting that Grant's old coach-house goes on - but the television team sets off to look at other people's solutions to the pressures of industrial life. [Granada Television Production].
1200 Weekend World
Peter Jay heads a team of top reporters which puts internationally important events into a new perspective. [London Weekend Television Production].
1310 Cartoon Time
1315 The London Weekend Show
Another edition of London's current affairs programme for young people in which Janet Street-Porter looks at the kind of topics that effect you in the capital today. This week: the first of a two-part programme on the problems facing young people with an unwanted pregnancy. [London Weekend Television Production].
1345 The Protectors
'Lena' by Trevor Preston. A girl journalist places herself in grave danger when she sets out to expose an Italian politician.
1415 Sportsworld '77
Dickie Davies introduces the summer magazine featuring a variety of sports. This week: the British Hovercraft Grand Final from Kent; Sailing - Weymouth Olympic week; Speedway - the Northern Masters. Plus an exciting quiz with an electronic game as a prize. [London Weekend Television Production].
1500 Film: The Lions Are Free
Whatever happened to the lion which took part in Born Free, Elsa the lioness? This fascinating documentary film, narrated by Virginia McKenna, investigates what happened when Elsa, brought up by Joy Adamson, wife of Kenya game warden George, grew too big to be a household pet. To save her from life in a zoo, George trained her to hunt, to adjust to a life without human protectors, to be a wild animal once again.
1600 The Strauss Family
'Hetti' by David Butler. Johann Strauss marries Hetti Traffz and becomes even more successful. But the couple's happiness is marred by two deaths in the family. [ATV Network Production].
1700 King of the Castle
By Bob Baker and Dave Martin. Episode 5 - Roland attempts to see the Lord. [HTV Production].