FEARS that election papers will fail to reach voters in time were raised today.
More than 14m ballot forms are due to be delivered in all-postal votes in four regions, including Yorkshire and Humber.
One of the region's Euro-MPs claimed today the mail system would struggle to cope.
Liberal Democrat Diana Wallis said: "The original recommendation of the Electoral Commission said two regions were enough.
"With four regions in the mix, including ours, I am really concerned about whether the Post Office can cope."
Delivery of party leaflets had already gone wrong, Mrs Wallis said.
"This does not fill me with confidence that the ballot papers will be properly delivered," she added.
Voters must fill in their forms before election day on June 10.
Royal Mail bosses today gave assurances that ballot papers would arrive in time.
A spokesman said: "We have put in place a dedicated team to ensure the process runs smoothly."