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The Liberal Democrats today apologised for distributing misleading campaign literature to hundreds of Londoners.

Leaflets were posted through doors in Putney which wrongly credited trusted polling firm YouGov for data suggesting the party was neck-and-neck with the Tories.

The projections actually came from a company that is not a member of the British Polling Council and uses national polls to forecast local voter intention.

Lib Dem president Sal Brinton said the party was tightening up instructions for candidates and added: “We have had a discussion with the person who wrote that and asked them to make sure the right company is credited. That was an error for which I apologise.”

She apologised for another leaflet which claimed The Guardian had described the party as “winning and on the up”.

The newspaper was actually quoting leader Jo Swinson following the Brecon and Radnorshire by-election in August.