Mr Farage also claimed to see boxes where 99 per cent of the votes were for Labour's Jim McMahon – who branded Ukip supporters "rejects" last year.
He said: "It means effectively – in some of these seats where people don't speak English, but they're signed up to postal votes – effectively the electoral process is now dead."
Oldham West was already under investigation after the Electoral Commission named it as one of the constituencies alleged to have a "greater risk" of voter fraud.
There were 7,115 postal votes this time around, 25.6 per cent of the overall vote – but the average for a general election is 16 per cent.
And in May, 19 per cent of voters in Oldham West opted for the postal vote. Express.
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