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Sunday Telegraph journalist Tom Harper used a different name, ‘joined' UKIP and volunteered to work as an intern at UKIP's press office in London - for the sole purpose of gathering a news story about UKIP.

Having spotted the plot and sent him packing, UKIP are now considering taking the case to the Press Complaints Commission.

Jonathan Arnott said, "I have emailed the Sunday Telegraph to tell them that I will no longer buy their newspaper unless they convince me that their attitude has changed. Anyone who wants to do the same should contact Patience Wheatcroft at patience.wheatcroft@telegraph.co.uk"