Hi Hawalkden
I have just telephoned the National Blood Service who confirmed that Type 1 Insulin Dependent Diabetics cannot donate blood.
Diabetics who are controlled on diet and/or some oral medication can be considered as blood donors but on an individually assessed basis.
If you wish to speak with the National Blood Service to clarify they have a 24 hour donor helpline on Tel: 0300 123 23 23.
Txx