Process.
Step 1.
Get forms D2, D4, VDIAB1 from DVLA (I would post a link but that would keep changing)
Step 2.
Attended appointment with a doctor (£60 cost to me) to fill in my D4. (this will most likely NOT be your GP, so do a search on google for "D4 License". 20 minutes of talk, reading eye chart, blood pressure, medication and glancing at your accu-chek (in my case) monitor for at least 90 days continous readings. (This appointment occurs every 5 years).
Step 3.
D2, D4, VDIAB1 and driving license sent to DVLA 24/07/2021 (took a few photos of my license and emailed them to myself to ensure it comes back with everything it had on before).
Step 4.
98 days later.
Letter received today from DVLA dated 26th October asking me to make an appointment with my diabetes specialist within the next 6 weeks and then telephone DVLA with the date of the appointment. (they pay for this one).
Appointment with Diabetic Consultant on the 11th November. Telephoned DVLA on an automated line with no issues, using the keypad to input the required info.
Day 146.
Got letter from the DVLA today (Dated 7th December 2021) stating my consultant still hasn't sent details from my 11/11/2021 appointment to them.
Step 5.
Day 174.
Got letter for DLVA asking me to make an appointment at diabetic clinic to see an "independent hospital consultant".
Day 214.
Appointment to see independent hospital consultant 21/02/2022. Went through meter readings, asked about lows, asked about awareness of lows. That was it.
Day 231.
Online System updated with new codes, can now drive over 3500kg again.
Day 234.
Physical license came through today.