Fewer people in Poland means less pressure on limited resources like good quality housing and healthcare allowing living standards to improve
This will also help reduce the unemployment rates for the country. The unemployment rate in Poland decreased by more than 10% in the four years after joining the EU
Migrants will return to Poland with new skills
Birth rate is lower as male migrants are away in the UK so there will be a decline in the population further reducing the strain on resources
Migrants often send money home to their families meaning people have more money in Poland helping to improve standard of living
The most educated and healthy people leave Poland which could hinder the countries development
It tends to be older populations that stay behind in Poland causing an ageing population. The death rates ay increase due to the ageing population
Active and educated people left Poland ('brain drain') and resulted in a skills shortage in donor countries (Poland)
Families were split up and the family members remaining in country of origin (Poland) may become dependent on money being sent home by migrant worker family members in the UK