The NFUs London rally set to take place on November 19 has now reached “full capacity”, with the call for unregistered members to stay at home.

The ‘mass lobby of MPs’ will be staged at the Church House conference centre in Westminster and will outline farmers concerns regarding the chances to inheritance tax, namely agricultural property relief (APR) and business property relief (BPR).

In their latest update the NFU have been amazed by the popularity of the event and commended the show of support from the industry, stating they expect 1800 farmers to be in attendance.

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Due to the high demand for places the NFU were forced to reschedule their original plans and will now operate via three rotations to accommodate the venue that holds just 600.

Farmers who have not registered have been told not to travel to the capital with the event at “full capacity”.

Many farmers have expressed frustration over this news, voicing their concerns online and calling for a more forceful approach to protest, similar to tactics seen in Europe. Some argue that to make their voices heard, they should block London's roads with tractors and spread slurry as a way to draw attention to their cause.

However, this militant approach has drawn criticism from others, suggesting that turning the public against them at this time would be a costly mistake.

In a letter to members the NFU explained that they are unable to make the event any larger and must be wary of legal matters.

They said: "We can’t simply turn up in numbers in Westminster on the streets, or the open spaces.

"We cannot risk either member or public safety, or the loss of public support, that could come from what could be an illegal demonstration."

But, they have clarified that this will not be a standalone event and should the voices of farmers not be heard and the changes to APR and BPR removed then more will follow.

"We are asking members who have not registered not to do so now, we want this to be the first event, not the only event, where you can be heard," the letter said.

"Far more than 1,800 NFU members want their voice to be heard, and rightly. The level of anger in the industry may never have been so high."

Registrations for the London rally opened last week following the NFUs warning to government that the changes to APR and BPR needed to be overturned.

The NFU's new letter to its members concluded that there would be "another opportunity to make clear how you feel."

"We’ve always said this event was just the start of this fight - if the government listens to us, before or after the 19th, we’ll all be relieved," the NFU said.

"But if it doesn’t, this event will be followed by another, at which farmers and growers will demonstrate how we feel about this devastating policy.

"If we need it, that will be our show of mass unity and strength."