By Julia Onslow Cole If the immigration system remains as it is, the UK will be closed for business, writes London Chamber of Commerce & Industry chair Julia Onslow Cole Immigration is doubtless one of the key battlegrounds on which the upcoming general election will be fought. The combination of record levels of net migration – which according to official figures reached 672,000 in the year to June 2023 – and the prominence of the Prime Minister’s Rwanda plan has put immigration at the top of the political agenda. Given this, it is understandable that wider public salience of the issue is hig…