Walk on the Wild Side (Saturday, BBC One, 5.50pm) Remember Johnny Morris? If you’re over 30 and used to watch a lot of telly as a nipper, then you certainly should do.

He was the main (human) face of Animal Magic, and in his day was a national treasure. He also spent a large amount of the programme giving voices to the creatures at London Zoo. It was amusing then and, 20-odd years later, it’s still amusing.

So, it shouldn’t come as a surprise to find that the idea has been dusted down and given a 21st-century spin. This programme can hardly be described as groundbreaking, but it should be very funny indeed.

Among the furry and feathered friends on view will be the Scratching Badgers, the Not-Very-Scary Sharks, the DIY Orang-utan, the Vultures’ Flying School and Alan the marmot.

Revelations: How Do You Know God Exists? (Sunday, Channel 4, 7pm) Programme makers may have wanted to consider the meaning of the word “faith” before putting this show together.

After all, it rather revolves around the whole notion of believing without knowing.

But this is Channel 4. And the previous episodes packed with revelations have been rather good.

Film-maker Anthony Thomas interviews leading figures from the five principal faiths in Britain — Anglican, Catholic, Jewish, Muslim and Hindu — about their beliefs.

As well as discussing their concepts of God, heaven and hell, they speak about divisions within their ranks and what they think of crimes committed in the name of religion.

The participants are the Archbishops of Canterbury and Westminster (Rowan Williams and Vincent Nichols), Chief Rabbi Jonathan Sacks, Swami Pramtattvadas and Professor Tariq Ramadan.

Future of Food (Monday, BBC Two, 9pm) In the west, it’s difficult to go hungry in this fast-food, pre-processed age. But times are changing.

With recent food riots on three continents and unprecedented competition for food due to population growth and changing diets, news anchor George Alagiah looks at why food security could become the most pressing global issue this century.

In this opening programme, he visits farmers and food experts in Britain and overseas to find out why food production is facing a global crisis and how population growth, climate change, water shortages and oil supplies will affect the way food is produced and consumed.

In Kenya, a Maasai chief tells George why he thinks climate change is to blame and back in the UK, an English farmer shares his thoughts on why food production here is also being hit by changes in the seasons.