I see the remainiacs are being very cute with their responses concerning the horsemeat scandal in Ireland.
1)The suspect burgers were produced at two Irish processing plants, Liffey Meats and Silvercrest Foods, and one plant in the UK, Dalepak Hambleton.One burger from the Silvercrest meat processing factory in Co Monaghan was found to contain 29% horse meat.By 16 January 2013 four subsidiaries of ABP had been accused of supplying adulterated meat. They were Silvercrest in County Monaghan, Dalepak in North Yorkshire, Freshlink in Glasgow, ABP Nenagh in County Tipperary, Ireland and Dairy Crest, Rossington.
2)In the UK Of 27 beef burger products tested, 37% were positive for horse DNA, and 85% were positive for pig DNA. Of 31 beef meal products tested, 21 were positive for pig DNA but all were negative for horse DNA. 19 salami products were tested but were negative for all foreign DNA.[13] Of the 37% of beef products tested positive for horse DNA, Tesco's inexpensive Everyday Value Beef Burgers tested at 29.1%. All other reported brands had less than 0.3% horse DNA. These products originated from Liffey Meats and Silvercrest Foods in Ireland and Dalepak Hambleton food processing plant in the United Kingdom. Trace amounts of horse DNA were also found in raw ingredients imported from Spain and the Netherlands.

A simple analysis of the situation suggests that Criminal activity occurred somewhere in the long supply chain. The EU checks   on the supply chain documentation and verification of stated material failed miserably. Ireland imported dodgy meat and sold the resulting burgers both nationally and exported to the UK, before the adulteration was picked up.
There are no winners in this fiasco, it merely highlights the fact that despite vetting and checking if criminals wish to be criminals, for a time they will be.
Would the UK checks be more stringent were the meat originating outside the UK? The answer would have to be yes, because everyone relies on everyone else in the EU and engenders a very false sense of security. Theoretically meat movement within the EU should carry documentation ensuring accountability every step of the process from farmgate to plate. Could the EU deity perhaps have feet of clay?