Right-wing firebrand shakes up cosy Swiss politics

* Blocher behind referendums on immigration

* Critics call SVP man a populist and threat to stability

* He says his moves secure Swiss independence

By Caroline Copley and Katharina Bart

MAENNEDORF, Switzerland, Feb 1 (Reuters) - As a child growing up near the Swiss border with Germany in the early 1940s, Christoph Blocher remembers soldiers camping out in his family's garden, ready to defend the neutral nation against a surprise attack from the Nazis.

The godfather of the right-wing Swiss People's Party (SVP), which has unnerved investors with plans to cut immigration and demote international law, says the experience instilled a fierce desire to shield Switzerland from external influences.

"That sort of experience makes quite an impression on a four or five-year-old boy, and it paints a distinct picture of Switzerland's strengths," Blocher told Reuters in his modest office building overlooking a train station in Maennedorf, a lakeside village outside Zurich.

Under the direction of the 74-year-old billionaire, who speaks in a local dialect he calls "farmer German", the SVP has shaken up the cosy, consensual system which has governed the Alpine nation since the end of the second World War.

To his fans, Blocher is a heroic defender of traditional Swiss values who has grown a niche party of farmers and small businessmen into Switzerland's most popular political party.

To his critics he is a divisive populist, who has brought instability to a once safe haven for companies and investors.

Yet the party won more than 26 percent of the vote in the last election, in 2011, and, according to polling firm Vimentis, is set to win more than 32 percent in the next one, in October.

In May, Blocher resigned from the parliament in Berne so he could spend more time furthering his policies through popular initiatives or referendums, a particular feature of Swiss politics.

Stopping "mass immigration" and what he sees as Switzlerand's drift towards the European Union are at the top of his priority list. "If you're marginalised in Berne, then you have to work with popular initiatives," he said.

The SVP was the driving force behind a referendum last year which has forced the government to introduce new limits on immigration, threatening its ties to the European Union.

In a "Save our Swiss gold" referendum in November, the SVP tried and failed to force the Swiss National Bank (SNB) to buy vast quantities of the precious metal, despite warnings from the central bank that it would cripple its monetary policy.

Such polarising moves have made it hard for the SVP to forge alliances in Berne, even though it is the largest party.