An unelected body of bureaucrats does not rule over 27 states of the EU, Thea.
Did you read that claim on the side of a bus?
Your claim:
its unlikely that there would be mass worker flows to one or two countries doing far better than the rest at any given time - especially as their most mature economy, Singapore – doesn’t have a population much bigger than that of Scotland.
Reality:
^Immigration to Singapore is historically the main impetus for population growth in the country since the founding of modern Singapore in the early 19th century. Immigration and immigrant workers in Singapore have been closely associated with the Singapore's economic development. For a long period after its founding the majority of its population were immigrants; it was not until around the 1930s that the number of native births in Singapore would overtake net immigration. After its expulsion from Malaysia in 1965, immigration laws were modified in 1966 to reinforce Singapore's identity as a sovereign state. However, the initial strict controls on immigrant workers were relaxed as demand for labour grew with increased industrialisation. Immigration would again become the largest contributor to population increase in Singapore in the late 20th century and early 21st century..
.....The high level of foreign migrant workers in late 20th and early 21st centuries meant that Singapore has one of the highest percentages of foreigners in the world. By the middle of the 2010s, nearly 40% of the population were estimated to be of foreign origin; although many have become permanent residents, most of them were non-citizens made up of foreign students and workers including dependents.[14] Between 1970 and 1980, the size of the non-resident population in Singapore doubled. The numbers began to increase greatly from 1980 to 2010. Foreigners constituted 28.1% of Singapore's total labour force in 2000, to 34.7% in 2010,[15] which is the highest proportion of foreign workers in Asia. Singapore's non-resident workforce increased 170% from 248,000 in 1990 to 670,000 in 2006 (Yeoh 2007). By 2010, the non-resident workforce had reached nearly 1.09 million, of these 870,000 were low-skilled foreign workers in Singapore; another 240,000 were skilled foreign worker, better-educated S-pass or employment pass holders. Malaysia is the main source of immigrants in Singapore (386,000 in 2010), followed by China, Hong Kong, and Macau, then South Asia, Indonesia, and other Asian countries.[15] As of June 2014, the total population of Singapore stands at 5.47 million: 3.34 million citizens and 0.53 million permanent residents (total resident number 3.87 million), with 1.60 million non-residents with work passes and foreign students.[16]
In Singapore, the term immigrant workers is separated into foreign workers and foreign talents. Foreign workers refers to semi-skilled or unskilled workers who mainly work in the manufacturing, construction, and domestic services sectors. The majority of them come from places such as People's Republic of China [1], Indonesia, India, Bangladesh, Pakistan, Myanmar, Sri Lanka, the Philippines, and Thailand, as part of bilateral agreements between Singapore and these countries. Foreign talent refers to foreigners with professional qualifications or acceptable degrees working at the higher end of Singapore's economy. They mostly come from India, Australia, the Philippines, People's Republic of China, Taiwan, Hong Kong, Japan, Republic of Korea, Malaysia, Europe, New Zealand and the United States
en.wikipedia.org/wiki/Immigration_to_Singapore
You must not have encountered many natives of the Philippines on your travels -
Few countries have as many of their citizens living abroad as the Republic of the Philippines, or depend so greatly on migration for their economic vitality. According to the government, more than 7.3 million Filipinos, or eight percent of the country's population, currently reside abroad. From 1990 to 2001, official recorded remittances alone averaged 20.3 percent of the country's export earnings and 5.2 percent of GNP, providing a lifeline for many families in a poor country that saw little economic growth in several of those years.
However impressive, these figures understate the role that migration plays in Filipino national culture and public policy. For more than 25 years, export of temporary labor has been an explicit response to double-digit unemployment rates. The government has developed a sophisticated policy regime to promote and regulate labor emigration.