Peppergirl,
Sadly no, on the DIAB form (and indeed the VDIAB1I - the corresponding form for Vocational drivers) only has fields for you to give consultants and GP details, so when the say healthcare professional they mean either of your named professionals. Since you are on insulin the usual protocol is to see a GP at diabetic satellite clinics or diabetic hospital clinics although you may not see a doctor at every clinic, but will see the doctor at at least alternate clinics.
They will only refer back to a GP nurse or hospital nurse specialist, in the case of diabetics on tablets only.
For Vocational drivers the process is more complicated with a series of 3 forms, where the 2nd form are to be completed by one of the doctors named on the stage 1 form. GP nurses have made the mistake of filling in DIAB2 forms and drivers have had their licences revoked if the licence has already expired.
I am T2