The Lib Dems’ Tim Farron has described a recent report on zero hours contracts as ‘deeply disturbing’:

http://www.huffingtonpost.co.uk/entry/lib-dems-gig-economy-policies-2017-general-election-manifesto_uk_59060aa1e4b05c39768048ad?

And meanwhile, Jeremy Corbyn has announced a pledge to get rid of zero hours altogether:

https://www.theguardian.com/politics/2017/apr/29/election-labour-mcdonnell-corbyn-zero-hours-economy