Ollie, I'm not trying to be mean, but you seriously have no sense of logic. It's really frustrating.
Any defeat can be pinned down to individual mistakes. What about England's fielding in the last 5 games? Does the mere fact that they play in India or the fact that they're playing a limited overs game instead of a Test cause their catching/fielding ability to lessen? It's all a part of an overall effect. The energy in the field, the concentration, the mentality - those are all factors which affect fielding - and they are very different when you're playing away from home. Just a few months ago we saw India arguably put in the best fielding performances in history in the knockout stages of the World Cup. Things would definitely have been different if the Test series was played in India.