Queen guitarist and rock legend Brian May is to lead a rally through Westminster against David Cameron's plan to legalise fox hunting.

Dr May and his animal trust Save Me will be there, along with PETA and the League Against Cruel Sports and Humane Society International will head down to Westminster to urge MPs to keep the fox hunting ban intact.

But why might the ban be revoked, where are the protests taking place and how can I get involved?

Where and when is the protest?

The protest will take place on Tuesday (July 14) at Old Palace Yard, SW1 Westminster, at 11am. That's directly outside the Houses of Parliament, where the statue of Richard Coeur de Lion is.

Brian May is also suggesting you rally your MP to the cause by asking to meet them on the day to make your argument to them.

Why might the ban be revoked?

David Cameron has made no effort to hide his opposition to the hunting ban, writing in the Countryside Alliance magazine earlier this year: "There is definitely a rural way of life which a born and bred Londoner might struggle to understand.

"I have always been a strong supporter of country sports. It is my firm belief that people should have the freedom to hunt, so I share the frustration that many people feel about the Hunting Act and the way it was brought in by the last government."

What happens on Wednesday?

Before the election, David Cameron promised a free vote on scrapping the Hunting Act altogether - a vote he would most likely lose.

But on Wednesday (July 15), MPs will get a free vote on whether to let a pack of dogs “flush out” foxes, rather than just the two allowed now.

Critics believe this is an underhand way of repealing Labour’s 2004 fox hunting ban without having to completely overturn legislation.

If passed, it may mean packs of baying hounds could be back chasing ­foxes by Christmas.

Because it's a free vote, it means that Tory MPs don't have to vote in line with their party policy - and with a slim majority anyway, this could mean a very close vote either way.

That's why it's important that if you don't want to see fox hunting be introduced back into UK culture, you need to get on to your local MPs by writing and emailing them, and joining in the protests.

What is the hunting ban?

The ban on fox hunting was introduced 10 years ago, in 2005. It bans hunting foxes - as well as deer, hare and mink - with dogs.

It was introduced by the Labour government, which is thought to be one of the reasons David Cameron and the Tories criticise it - because they feel that it shouldn't have been a priority for the government at that time.

Scotland also banned fox hunting a couple of years before England, and has separate legislation on the matter.

The act bans the pursuit of foxes with dogs as it is seen as inhumane and a cruel blood sport.

Notable supporters of the ban include Ricky Gervais and Brian May, but it also has some notable opposers, like Prince Charles (who said he "might as well leave the country and spend the rest of his life skiing" if hunting was banned).

Andy Burnham also slammed the Tory "back door attempts" at creating law around fox hunting which was impossible to actually enforce.