Updated

British Prime Minister David Cameron has called on India to further open up to foreign investment and loosen regulations that hamper businesses.

Cameron led a delegation of more than 100 British business leaders and spoke Monday in Mumbai, India's financial capital, hailing the "special relationship" between Britain and its former colony.

He announced a same-day business visa service for Indian investors and said there was no limit to Indian student visas. He said he would be asking New Delhi "to take down barriers and to make it easier to do business here in India."

Cameron is to continue his two-day visit in New Delhi and meet with Prime Minister Manmohan Singh.

Britain and India have pledged to double two-way trade to 23 billion pounds ($36 billion) by 2015.