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Fiat's UK-style revival plan faces Italian hurdles

* Italian revival plan aims to transform ageing model line-up

* Maserati and Alfa Romeo the focus of revival plan

* To unveil cabriolet version of Alfa Romeo 4C coupe at Geneva car show

* Hopes to tap overseas demand to offset weak core markets

* Unions doubt promise to save all Italian sites, re-instate workers

By Agnieszka Flak and Laurence Frost

MILAN/PARIS, March 1 (Reuters) - Idle plants, surly unions and a weak, ageing model line-up - the challenges facing Fiat Chrysler's Italian revival sound a lot like the British car industry's low point in 1982.

CEO Sergio Marchionne will be hoping the similarities don't end there as he orders up sporty new Alfa Romeos and sleek Maseratis in a bid to repeat in Italy what British brands like Mini and Jaguar have since achieved under foreign ownership.

After cementing its marriage to Chrysler in January, which will move the group's domicile and main share listing abroad, Fiat is turning back to long-delayed plans to relaunch its Alfa and Maserati marques, with which it has pledged to revive Italian production.

Next week's Geneva car show may offer early clues as the company wheels out a cabriolet version of the recently launched Alfa Romeo 4C coupe, along with the first Italian-made Jeep.

Marchionne said last month that Fiat plants have a bright future making "premium segment, high-quality products with reduced competition, more attentive customers and higher margins".

Like the British auto industry, which now exports 80 percent of its car production, Fiat aims to tap overseas demand.

That could soften the fallout from a six-year meltdown in Fiat's core southern European markets, where a nascent recovery promises to be slow.

But Marchionne faces hurdles including a big investment outlay, difficult Italian business climate and heavy unionisation among the workforce of 62,000.

"For a premium brand you need a broad offering of cars, but that's very expensive and takes time," said Commerzbank analyst Sascha Gommel. "I'm not sure Fiat can deliver that."

BMW's Mini and Tata Motors-owned Jaguar Land Rover have become cash machines for their parents, helping to propel British car production to a six-year high in 2013, including half a million Nissans made in Sunderland, northeast England.

Carmakers announced 2.5 billion pounds ($4.2 billion) of UK investment last year as national output rose to 1.59 million light vehicles, narrowing the gap with France, Europe's No.3 manufacturer after Germany and Spain. Italian output was below 630,000 vehicles, less than half its total a decade earlier.