<p><b>Britain's Prime Minister David Cameron arrives at the Conservative spring forum, in Cardiff.</b> <p><p></p> <p>India's unpredictable and non-transparent business climate could derail the growth of trade ties between Britain and Asia's third largest economy, British Prime Minister David Cameron has warned his Indian counterpart. <p><p></p> <p>Regulatory delays over London-listed Cairn Energy's $9.6 billion asset sale to Vedanta Resources, and legal wrangling over India's $2.6 billion Vodafone tax demand were raised by Cameron in the letter sent to Indian Prime Minister Manmohan Singh last month. <p><p></p> <p>Cameron, who visited India last year intent on securing big-ticket business deals, is keen on fostering substantial trade ties with the emerging power to boost economic growth in Britain, still struggling from the effects of the global recession. <p><p> <p> <p><b>Pictures by Reuters</b>