Hi
What i learned from our consultant is that they'll simply pause the case at this stage and transfer your file to India. Indian CHC will then further take action on your file according to their facilitation.
Not quite, you have to ask London to transfer the file to Delhi, there is no guarantee that they will. Only to "enhance the Immigration process". If you are in India you will have difficulty getting your passport from India to London or Abu Dhabi since you can't mail courier passport in/out of India.
PMM