Elections for US-style police and crime commissioners risk embarrassment by generating the "lowest turnout in British history", candidates have warned Home Secretary Theresa May.
In an open letter 50 days before polling day, Labour, independents and former Liberal Democrat London mayoral candidate Brian Paddick warned of a lack of public awareness and the November polling date.
Brian Greenslade, independent candidate for Devon and Cornwall, and Sue Mountstevens, also an independent standing in Avon and Somerset, are among the signatories.
The letter, organised by the Electoral Reform Society, calls for the Electoral Commission to write to every household telling them about the elections. It also urges the Government to make sure that broadcasts promoting the elections take place and to pledge that the election cycle will not again be held in winter.
Mr Greenslade, also Lib Dem leader of North Devon Council, said: "The upcoming elections are heading for the Guinness Book of Records for the lowest turnout for a national election.
"If the flawed system introduced by the Government is as important as it claims then they should accord them the same support as for a parliamentary elections. This would help provide a level playing field for non-party candidates and ensure people are fairly informed.
"This is especially important in Cornwall, Devon and the Isles of Scilly, where many people don't have access to the internet."
Mr Greenslade opted not to stand as a Lib Dem, arguing that policing should not be politicised.
Police and crime commissioners are due to take over from local police authorities in a bid to provide an accountable figurehead.
Katie Ghose, chief executive of the Electoral Reform Society, said: "If the Home Secretary is serious about people having a say, she needs to listen to the warnings coming from all sides and take action now."
Earlier this week, Home Office Minister Jeremy Browne admitted a 20% turnout would not be good.
Mr Browne, Lib Dem MP for Taunton Deane, said police commissioners would be "the George Washingtons" of the job, given that – like the first president of the United States – they would have no predecessors in the job.