"cool , thanks , one quick doubt , does the medical certificate details get transferred automatically on to the new booklet , as i would be renewing my category 1 before applying for renewal"
The license isn't a passport so they have no interest in you handing in your old one. Regarding the medical, make sure you check that the new booklet contains the actual date for your latest medical. If you renew it around the same time as your medical it may not in which case you will have to hang on to both until your next medical.
This does not apply to your ECG date as that is for information only.