What would be the impact of increases in tariff/trade barriers between the US and other nations like the UK?

Background

The International section covers a range of issues that reflect HM Treasury's responsibility for promoting and protecting the UK's international economic interests, ensuring the country thrives in an ever-changing global economy. It also relates to the department's important role on the international stage, with responsibilities for trade and customs policy, sanctions policy and cooperating with other countries in forums such as the G7, G20, IMF and others.