Risks of EU Enlargement for the UK
Extra budgetary costs for financing EU programmes – most of the new member states of the EU are relatively poor in terms of real GDP per capita and the EU has raised the size of their spending on cohesion funds much of which has been targeted at relatively poorer countries and regions.
Social and economic pressures from inward labour migration
A shift of foreign direct investment and jobs to Eastern Europe – partly driven by tax competition and by lower unit labour costs.