Jeremy Clarkson will explain this weekend how he nearly lost his leg in an accident on Diddly Squat Farm.

The media star turned farmer tells The Jonathan Ross Show, which airs on Saturday: "How it didn't take my leg off... I didn't walk properly for a week.”

He explains: "I got this thing called a telehandler, it's like a JCB thing. I thought 'I'll just use its front to push the post in'.

"It got halfway into the ground and the fence was leaning on it and it flicked back. How it didn't take my leg off... I didn't walk properly for a week. This was a quarter of a tonne of fence post."

He adds that farming has more accidents "than all the other industries put together".

The TV presenter, 61, signed copies of his book Diddly Squat: A Year On The Farm at Jaffe and Neale bookshop in Chipping Norton last Friday.

He tells Ross how the hit show Clarkson’s Farm came about.

"It was an accident. I was contractually obliged - I had to make a programme on my own. I thought 'I'm slightly bored of Terminal 5. I'll film at home on the farm'. I thought what a lovely programme it would be to try and learn to be a farmer. I genuinely love it out there."

And talking about his co-host – or co-star - Kaleb Cooper, the Grand Tour presenter says: "He's entrepreneurial, that's how I'd describe him.

"The [farm] shop is a huge success and consequently we've had to mow a field near it so people can park there and it's really a mud bath. Kaleb now goes up and charges people £15 to tow their cars out."