Is there any quality difference between machines from UK and India?

No, there is no quality compromise on JCB products. JCB manufacturing standards are consistently maintained in all factories throughout  the world. The same quality control applies to its manufacturing process. The only difference is the compliance issue with respect to emission standards. We prefer to import engines with their standard due to high sulpharic content in the fuel available in the market; whereas Europe does not allow engines less than that.