Stripey, the 2010 LD voters were not lentil weavers.
Many were disaffected former Blairites. Many then went to the Tories in 2015. As a group they are not loyal voters who feel this identity issue with how they vote - they are far less tribal than other voters.
I don't think lentil weaving image is too much of an issue.
Where it comes into play is with people who have voted Labour or Conservative all their lives and then decide to switch. That comes down to whether the liberal label is more important that the socialist or conservative one. As UK politics becomes more authoritarian v liberal that importance changes. Trump will amplify the effect.
If Labour are not representing this, they are not understanding what questions are being asked by the public of themselves now. They should be going to that BBC seven classes thing and asking a few questions. There was a yougov poll this week which had them down as the third most popular party amongst CDE class voters.
Personally I think they might do themselves a favour if they started talking about there being a different class system in 2017 rather than being so hung up on the traditional working classes. Who have an average age of over 66. Labour are also terribly behind in support from the over 65.
They are the LABOUR party. As in the party of the workers. The people who do jobs. Yes the population is aging but that does not mean that older people would not support an agenda based on this, because of how it would support their children and grandchildren.
Stop making it about classes that were relevant 30 years ago. Reframe the agenda. Start making it relevant to today's society. Put the word LABOUR back into the heart of what they are. Labour can apply to various economic backgrounds. There actually isn't a real reason why it should confine itself to an outdated definition of class.
There really is room for a rebranding here imho.