Election polls 2015: what went wrong?

Post-mortem into failure to forecast result points the finger at 'unrepresentative' sampling methods

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Opinion polls failed to predict the outcome of last year's general election as they failed to question enough Conservative voters, an independent inquiry has found.

What happened?

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Row 0 - Cell 0 LABCONLIBUKPGRNOTR
Populus3434101354
Ipsos Mori303571089
Opinium333491365
YouGov3434101257
ComRes343591246
ICM353491145
Survation3131101656
Panelbase333181658
TNS333471555
Ashcroft3333101168
BBC avg333481357