The party had sent "a number" of leaflets for its candidate in Islington North - Greg Clough - to an address in Islington South. At the time, the Lib Dems called it a "total cock up" that could cost Ukip thousands of pounds.
This week we bring you more news of Ukip's campaign going very, very wrong in neighbouring Hackney after a source contacted us with a mis-addressed leaflet.
The party has admitted to sending out "a couple of thousand" leaflets to Hackney South and Shoreditch instead of Hackney North and Stoke Newington after another postcode error.
Dave Raval, the Lib Dem agent for both Hackney constituencies, told i100.co.uk: "They can’t even work out which seat to send their literature to. It’s ridiculous."
A spokesperson for Ukip told i100.co.uk: "These things happen, it is certainly not endemic, but they are annoying."
They added: "You know we are hearing little stories of this sort across the country, with all parties bedevilled by the same problem."
So, we are putting out a call to readers. Have you received an error-strewn Ukip leaflet, or one from any other party, intended for another constituency? Email firstname.lastname@example.org, tweet us or write in the comments and let us know.
UPDATE: It's the day of the election. Here's what we found out:
Morley and Outwood
This candidate is actually standing in Elmet and Rothwell - but he delivered to Morley and Outwood, where Ed Balls is standing.