Government advice is social distancing for diabetics not self isolation - two slightly different things unless its changed recently.
From what im told, true self isolation letters will be sent out on Monday - so we will be included in this or not. In the mean time you can only do what you think is right and what his work will permit.
https://www.gov.uk/government/publi...n-social-distancing-and-for-vulnerable-people
Gov website gives the direct message - most other things come from news outlets or interviews with various health professionals who may or may not have the right end of the stick.