I wrote to the BBC to point out that December was the 40th anniversary of the programme, presented by Vincent Kane. According to the BBC’s website, it was first shown in December 1965.
I also suggested that the Long Street might be shown in the Rhondda to mark the 40th anniversary. They are now looking at showing extracts from it on BBC2W. They have promised to get back to me about the possibility of a screening in the Rhondda.