Roomi24,
Then why have you kept your relatives address in your application. Please update London Visa Office immediately of your change in address.
I have also observed that before they send you your medicals the following line is updated in E-CAS. When you click on "In Process" a second line will be added stating "We have reviewed your applcation and started processing on DATE" a couple of days later LVO sends your Medical Forms. This has been the case for as far as i know, ALL london visa office applicants, also New Delhi Visa Office follows the same way.
All the best!
ASMB