Those workers are essential to the Gibraltarian economy, which offers much-needed employment to the neighbouring poor Spanish region.
Since Brexit, usual border procedures have been temporarily waived to allow the negotiations to continue.
Both sides now want a deal before this June’s European elections and Spain has warned the status quo is not sustainable indefinitely.
“They seem to want to turn a Nelsonian blind eye to the huge problems that their Brexit has created for Gibraltar and our current economic model,” Mr Picardo said.
In response, a source said: “I don’t think Nelson would have turned a blind eye to the potential of Spanish police entering British territory without let or hindrance. That is the reality of what may happen if Gibraltar becomes part of the Schengen area.”
In the battle of Copenhagen in 1801, Horatio Nelson, who was blind in one eye, claimed to not see an order to disengage from the enemy and went on to score a famous victory.
“I see no ships” entered the popular imagination after the incident, which also led to the phrase to “turn a blind eye”.
Mr Picardo has been called to give evidence to the committee in what now appears certain to be a feisty session.
William Turner is a seasoned U.K. correspondent with a deep understanding of domestic affairs. With a passion for British politics and culture, he provides insightful analysis and comprehensive coverage of events within the United Kingdom.