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CARDIFF, WALES - MARCH 31: Liberal Democrats Cardiff MP Jenny Willott takes part in Q&A session with Panasonic staff at the Cardiff manufacturing plant on March 31, 2015 in Cardiff, Wales. Campaigning in the UK general election has begun with the Welsh Liberal Democrats visiting Panasonic's manufacturing plant in Cardiff. (Photo by Rufus Cox/Getty Images)

CARDIFF, WALES - MARCH 31: Liberal Democrats Cardiff MP Jenny Willott takes part in Q&A session with Panasonic staff at the Cardiff manufacturing plant on March 31, 2015 in Cardiff, Wales. Campaigning in the UK general election has begun with the Welsh Liberal Democrats visiting Panasonic's manufacturing plant in Cardiff. (Photo by Rufus Cox/Getty Images)