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Dated, but interesting. Look at the dates here, for example:
The collapse is long before Corbyn was leader, and in one case, results improved while he was in power.
How about some more recent reports, though.
April 2016:
https://yougov.co.uk/news/2016/04/08/camerons-ratings-now-lower-corbyns/
Historic tracker of voter intention:
http://ukpollingreport.co.uk/voting-intention-2
Labour trails, but marginally. With the SNP in the position it is in, that's not an "unelectable" Labour.
https://yougov.co.uk/news/2015/11/30/analysis-four-million-labour-voters-lack-trust/
https://yougov.co.uk/news/2015/09/25/measuring-gap-between-corbyns-supporters-and-labou/
http://www.independent.co.uk/news/uk/politics/jeremy-corbyn-loses-a-fifth-of-labour-voters-with-critics-already-plotting-to-oust-left-winger-10508584.html