Relations between the UK and India are suffering from fatigue and need revitalising, David Cameron, the Conservative leader, will tell Manmohan Singh, the Indian prime minister, at a meeting on Wednesday in New Delhi.

“You get a sense from Indian business people that the British should be doing more,” the Conservative leader said on Tuesday. “We have done well in the past, but there’s a sense that we’re now just sitting back and could miss out on the next wave if we don’t keep the effort up.”