I disagree about Till Death Us Do Part. Alf Garnett's never been more relevant, unfortunately.
He's clearly the villain of the piece and his views are demonstrated to be outdated and ignorant, which is where much of the humour comes from.
You probably don't want to tell them about Sean Connery's views on domestic violence, then...
You must log in or register to see media
Absolutely agree on Johnny Speight and Alf Garnet but it wouldn't get made today. It wouldn't.
On Spike Milligan, the story is very interesting. Milligan is of Irish ancestry but was born and brought up in India (a country that he adored). The character in Curry and Chips is actually him, as he was sufficiently sun tanned to be taken as Indian , when his family returned to London. He's playing out the weirdness of his early adult life in typical Milligan fashion...but again it can come across terribly.
Love Thy Neighbour and the others were insulting, even at the time.

