Week end magazine carried teenage letters around the late 1960s.
Daily Mail have had quite a lot of letters over the years, but recommend 1986 when news of outlawing C.P.
in state schools was hot.
There is a 3rd publication (Tit Bits) popular in the 1950s; also had letters concerning spanking, but the winner by far is `Picture Post'. The letters went on for about 4 months before the editor finally put a stop to them! pre 1920s there was a magazine called
`Domestic', it also carried letters from parents.
There have also been occassional letters in `Woman's Own', but you would need patience to research the mags.
I used to have dozens of cuttings but unfortunately my wife put them in the bin (She thinks I'm kinky) Really!