By Jessica Frank-Keyes Poorly defined objectives, an overzealous planning system and a disjointed supply chains are all reasons why the UK lags behind its peers on building major infrastructure, a report has found. Researchers at the Boston Consulting Group’s Centre for Growth dug into why exactly Britain’s infrastructure projects are often long-delayed and way over budget. The study comes after the i paper reported that the 14-mile Lower Thames Crossing – which is yet to see spades in the ground – has cost £297m in planning permission alone. While MPs have warned running HS2 from London and B…