Coming down from Yorkshire to London I usually walk through Marchmont Street. I often stop and look up at a Blue Plaque over a shop that was once a hairdressers. It’s where Kenneth Williams spent the first part of his life.

I worked with him in the late 1970’s when I was a young producer with a missionary society. We were looking at new ways of getting the Christian faith to resonate with young people.

I’d heard somewhere that the Ayatollah Khomeini, then exiled in Paris, was flooding Iran with messages on audio cassettes to topple the Shah. It may seem quite a leap but it prompted me to wonder if we too could use cassettes to reach out to the next generation.

So we hired four famous comedians to retell the life and parables of Jesus . Soon we were in the studio with Derek Nimmo, Dora Bryan, Thora Hird and - Kenneth Williams recording a sparkling script by Jenny Robertson.

Yesterday marked the Centenary of Kenneth Williams’ birth – one of Radio 4’s famous voices who knew the power of comedy to shock, to scandalise and to deflate the pompous. But he was also a sensitive man who prayed at the end of each day out of the depths of his own tortured soul.

He excelled in recording these cassettes and captured the way Jesus himself used stories to cut the powerful down to size, especially religious ones.

One of Jesus’ amusing stories was told against the hypocrisy of the judgmental - of two men, one with a plank shooting out of his eye trying to pick a spec out of the other’s – a comic sketch worthy of Basil Fawlty berating a hapless hotel guest!

The paradox of humour is that comedy can pack a serious punch which is why the powerful, especially dictators hate being made fun of. Nor can they tolerate the freedom the media give to voice such protest.

50 years on, Iran’s latest Ayatollah, while recognising the role media played in bringing them to power , now appears to be tightly controlling the internet, in what is widely seen as an attempt to stem the flow of information about a government crackdown on protesters.

Memories of Kenneth Williams today make me nostalgic for a more spacious world where the freedom to speak out and even to make fun of each other were the signs of safer times.

Kenneth Williams – rest in peace and in the memory of our laughter.