LONDON (Reuters) – The British government must be willing to make politically unpopular choices in areas such as immigration and regulation to boost business investment and economic growth, the Confederation of British Industry (CBI) said on Monday. Finance minister Jeremy Hunt is due to set out a raft of spending cuts and tax rises at a budget statement on Thursday as he seeks to show Britain can fix a hole in its public finances. The CBI said not matching those with measures to tackle labour shortages and productivity, at a time when many businesses are drawing up their 2023 budgets, would l…