The Danish government is coming under pressure from UK workers, unhappy they are being paid less far less industries rates, a practice that is illegal in Denmark.
More than 5,000 people have backed a petition to be handed to the Danish London embassy to prevent waste energy firms, many of which are backed by Danish pension funds, from paying up to 61 per cent less than standard wages.
Members from the GMB and Unite unions travelled to Copenhagen earlier this week to "confront" executives from Pensions Denmark.
Representatives from the Danish London embassy and Denmark's foreign ministry were unable to respond to requests for comment owing to the fact it is a bank holiday in the country on Maundy Thursday.
GMB national officer for construction Phil Whitehurst said the visit to Denmark earlier in the week led to "significant steps" being taken to change the situation. He said:
“We have asked the Danish Government now to sit up, take notice and investigate these companies involved.
“Undercutting is an unfair and exploitative practice.
It means foreign workers are being underpaid, while UK workers are missing out on jobs just because they demand a fair wage.
But we will not stop here – and will go to whatever lengths necessary to see this through.