A 1 year license, renewal, then a 3 year license

My license was revoked. I have a low hba1c. I filled out the application and paid the fee for a new license, had an initial discussion with my regular consultant, had a cgm for a week, saw an outside consultant who looked at my last 3 months on my blood meter. I was then given a license for only 1 year.

Fast forward a year. I filled in my application form which was sent to me by the dvla without me having to ask. A few weeks later I got a licence for 3 years. Thank you!