The deal - which took three years to negotiate - will make it easier for UK firms to export some goods including whisky, cars and other products to India, and cut taxes on India's clothing and footwear exports to the UK.

Last year, trade between the two countries totalled £42.6bn. The government has said the deal would boost that trade by an additional £25.5bn a year by 2040.

The UK government said lowering tariffs on the likes of clothing, jewellery, and frozen prawns "could" lead to cheaper prices and more choice for consumers.

One part of the deal extends an exemption on national insurance contributions (Nics) from one to three years - meaning people on short-term visas will only make social security payments in their home country when working abroad.