Queen guitarist Brian May has renewed calls for the Government to abort plans to cull thousands of badgers in an effort to tackle bovine TB.
May said: "The great bit of new information is it has now been demonstrated that the cull cannot make economic sense. It will lose the taxpayer money rather than save it.
"That was really the last shred of reason that you could give for this cull going ahead. It is a very good time for Mr Cameron to reconsider and withdraw from this monstrous cull, in the public interest.
"Our point is to save wild animals from abuse and there is no doubt this cull is going to cause intense pain on a massive scale to badgers. You cannot call it humane, which is apparently what these pilot culls are about.
"It has become increasingly apparent to me that, although we call ourselves a nation of animal lovers, we treat them appallingly".
We spoke to anti-badger cull protesters in Bristol as they boarded a coach for the London demo this morning. We asked them what means they will go to in order to disrupt the shooting.
Rock star Brian May will today lead a rally against planned badger culls, due to begin from this weekend in an effort to tackle bovine TB.
The Queen guitarist, a long-time campaigner against the plan, will be joined by TV naturalist Bill Oddie as they lead a march through Westminster.
Organisers say they expect thousands to join them, all wearing badger masks, in an effort to demonstrate their opposition to the culls, the pilots for which are in west Gloucestershire and west Somerset.
Some 5,000 badgers are set to be killed in the two south west regions, with policing costs expected to reach £4 million to cope with potential disruption from activists.
Police last night said they were "prepared" for any disruption and protests.
The Government plans to roll out badger culling more widely in hotspots of the TB disease, if this weekend's pilot culls are successful.
The costs of the cull will be borne by farmers.
But experts, including scientists behind the long-term trial, have raised concerns that the policy will have "unimpressive" results in reducing TB and suggested that it does not make economic sense.
And protesters, led by rock star Brian May, have pledged to do everything possible to stop the cull, which they claim is not justified by the science and is inhumane.
Controversial culling of badgers as part of efforts to tackle TB in cattle goes ahead from this weekend, in the face of protests from animal welfare campaigners.
Some 5,000 badgers are set to be killed in two pilot culls in west Gloucestershire and west Somerset, with policing costs expected to reach £4 million to cope with potential disruption from activists.
The pilot culls aim to ensure free-running badgers can be killed humanely, with marksmen observed by independent experts to check they are killing the protected animal swiftly, and post-mortem examinations carried out to assess speed of death.
The pilots will also assess whether sufficient badgers can be killed in an area to have an effect in reducing TB in cattle, following a long-term study which found that culling 70% of badgers in an area could reduce the disease in herds by 16%.
A study of DNA analysis has shown for the first time that tuberculosis (TB) can spread between cattle and badgers living near farms.
Researchers found outbreaks of the disease were linked between the animals by monitoring changes in the bacteria's DNA during a spread of bovine TB in Northern Ireland.
They mapped the genetic blueprints, or genomes, of bacteria isolated from 26 cows and four badgers while the disease spread.
The findings, published in the online journal Public Library of Science Pathogens, could not prove whether the disease was spreading from badgers to cattle or in reverse.
But the evidence is likely to prove significant in the debate over controversial Government plans for a mass badger cull in England, which was recently postponed amid widespread protests.
A new inquiry will be launched to examine the vaccination of badgers and cattle in relation to Bovine TB, the Environment, Food and Rural Affairs Committee has said.
The inquiry is expected to cover the likely timescales and challenges in delivering vaccination programmes, their costs and efficacy, and whether a vaccination programme could be delivered without having a negative effect on UK exports.
Animal rights activists have told ITV News how they are preparing to disrupt the proposed cull of badgers in Gloucerstershire. Farmers want it to go ahead because the animals can spread Bovine TB.
The National Farmers' Union (NFU) has said it supports the Government's decision to go ahead with a pilot cull of badgers in an attempt to prevent the spread of Bovine TB.