Diddly Squat celebrity Jeremy Clarkson has arrived in London to join farmers protesting government policies including inheritance tax.

An estimated 20,000 people from around the country have descended on the capital, to protest changes to the inheritance tax announced in Labour's first autumn budget, a so-called "tractor tax".

The changes mean that instead of the previous 100 per cent relief for inheritance tax for farms being passed on, only the first £1million would be tax-free. 

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Mr Clarkson has been vocal on social media about his disapproval of the policy and has arrived at the rally to support the cause in person, seen holding a sign that said "With our farmers #together".

Speaking to Sky News, Mr Clarkson said: "This is where your food comes from. If the government ends farming, which is seemingly what it wants to do, then where do we get our food from?

"I think its the end. If you actually stop and think about it, it's the end."

Environment Secretary Steve Reed has insisted that only a few hundred farms would be impacted by the tax change, rather than the tens of thousands claimed by unions. 

He told the PA news agency: “The Government’s been very clear: about 500 farms will be affected and the vast majority of farms will pay nothing more under the new scheme.

“If farmers look at the facts they will see the vast majority of them will pay nothing more under the new scheme than they did under the old scheme.”