British Prime Minister David Cameron and his Indian counterpart Dr.Manmohan Singh began talks on Tuesday that focused on boosting trade and commercial ties between the countries. Cameron and a 100-member business delegation arrived in the Indian capital after a day-long trip to Mumbai, where he said Britain would introduce same-day visa services for Indian investors. Cameron was to push economic ties during the talks with Singh at New Delhi's Hyderabad House, officials were quoted as saying by DPA. Cameron was due to attend a summit organized by Indian business chambers and to meet President Pranab Mukherjee later Tuesday.